[benchmark] Add language version comments to benchmarks.

Change-Id: I44047a9d7907d166a6360397d0047ce9b835e5c7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166854
Auto-Submit: Jonas Termansen <sortie@google.com>
Reviewed-by: Leaf Petersen <leafp@google.com>
Commit-Queue: Leaf Petersen <leafp@google.com>

benchmarks/BigIntParsePrint/dart2/BigIntParsePrint.dart

@@ -4,6 +4,8 @@
 
 // ignore_for_file: avoid_function_literals_in_foreach_calls
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 import 'package:fixnum/fixnum.dart';
 

benchmarks/BigIntParsePrint/dart2/native_version.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 abstract class NativeBigIntMethods {
   bool get enabled;
 

benchmarks/BigIntParsePrint/dart2/native_version_dummy.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'native_version.dart';
 
 const NativeBigIntMethods nativeBigInt = _DummyMethods();

benchmarks/BigIntParsePrint/dart2/native_version_javascript.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 @JS()
 library native_version_javascript;
 

benchmarks/Calls/dart2/Calls.dart

@@ -4,6 +4,8 @@
 
 // Micro-benchmarks for sync/sync*/async/async* functionality.
 
+// @dart=2.9
+
 import 'dart:async';
 
 const int iterationLimitAsync = 200;

benchmarks/Dynamic/dart2/Dynamic.dart

@@ -8,6 +8,8 @@
 // similarly defined functions and closures except that the parameters and
 // return types are all dynamic.
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 
 const int kRepeat = 100;

benchmarks/EventLoopLatencyJson/dart2/EventLoopLatencyJson.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:isolate';
 
 import 'json_benchmark.dart';

benchmarks/EventLoopLatencyJson/dart2/json_benchmark.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:math';
 import 'dart:convert';
 

benchmarks/EventLoopLatencyJson/dart2/latency.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:async';
 import 'dart:io';
 import 'dart:math' as math;

benchmarks/Example/dart2/Example.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 
 class Example extends BenchmarkBase {

benchmarks/FfiBoringssl/dart2/FfiBoringssl.dart

@@ -4,6 +4,8 @@
 
 // Macro-benchmark for ffi with boringssl.
 
+// @dart=2.9
+
 import 'dart:convert';
 import 'dart:ffi';
 import 'dart:typed_data';

benchmarks/FfiBoringssl/dart2/digest.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:ffi';
 import 'dart:io';
 

benchmarks/FfiBoringssl/dart2/dlopen_helper.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:ffi';
 import 'dart:io';
 

benchmarks/FfiBoringssl/dart2/types.dart

@@ -4,6 +4,8 @@
 
 // ignore_for_file: camel_case_types
 
+// @dart=2.9
+
 import 'dart:ffi';
 
 /// digest algorithm.

benchmarks/FfiCall/dart2/FfiCall.dart

@@ -7,6 +7,8 @@
 // These micro benchmarks track the speed of reading and writing C memory from
 // Dart with a specific marshalling and unmarshalling of data.
 
+// @dart=2.9
+
 import 'dart:ffi';
 import 'dart:io';
 

benchmarks/FfiCall/dart2/dlopen_helper.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:ffi';
 import 'dart:io';
 

benchmarks/FfiMemory/dart2/FfiMemory.dart

@@ -9,6 +9,8 @@
 // These micro benchmarks track the speed of reading and writing C memory from
 // Dart with a specific marshalling and unmarshalling of data.
 
+// @dart=2.9
+
 import 'dart:ffi';
 
 import 'package:ffi/ffi.dart';

benchmarks/FfiStruct/dart2/FfiStruct.dart

@@ -7,6 +7,8 @@
 // Only tests a single field because the FfiMemory benchmark already tests loads
 // and stores of different field sizes.
 
+// @dart=2.9
+
 import 'dart:ffi';
 
 import 'package:ffi/ffi.dart';

benchmarks/Isolate/dart2/Isolate.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:async';
 import 'dart:isolate';
 import 'dart:typed_data';

benchmarks/IsolateJson/dart2/IsolateJson.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';

benchmarks/IsolateSpawn/dart2/IsolateSpawn.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:async';
 import 'dart:isolate';
 import 'dart:math';

benchmarks/IsolateSpawn/dart2/helloworld.dart

@@ -1,3 +1,5 @@
+// @dart=2.9
+
 void main() {
   print('Hello, world!');
 }

benchmarks/IsolateSpawnMemory/dart2/IsolateSpawnMemory.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:async';
 import 'dart:developer';
 import 'dart:io';

benchmarks/IsolateSpawnMemory/dart2/helloworld.dart

@@ -1,3 +1,5 @@
+// @dart=2.9
+
 void main() {
   print('Hello, world!');
 }

benchmarks/ListCopy/dart2/ListCopy.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:collection';
 import 'dart:typed_data';
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/MD5/dart2/md5.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';

benchmarks/RuntimeType/dart2/RuntimeType.dart

@@ -7,6 +7,8 @@
 // ignore_for_file: prefer_const_constructors
 // ignore_for_file: avoid_function_literals_in_foreach_calls
 
+// @dart=2.9
+
 import 'dart:typed_data';
 
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/SHA1/dart2/sha1.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';

benchmarks/SHA256/dart2/sha256.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'package:benchmark_harness/benchmark_harness.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';

benchmarks/SkeletalAnimation/dart2/SkeletalAnimation.dart

@@ -5,6 +5,8 @@
 /// A Dart implementation of two computation kernels used for skeletal
 /// animation.
 
+// @dart=2.9
+
 import 'dart:typed_data';
 
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/SkeletalAnimationSIMD/dart2/SkeletalAnimationSIMD.dart

@@ -5,6 +5,8 @@
 /// A Dart implementation of two computation kernels used for skeletal
 /// animation. SIMD version.
 
+// @dart=2.9
+
 import 'dart:typed_data';
 
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/SoundSplayTreeSieve/dart2/SoundSplayTreeSieve.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:collection';
 import 'dart:typed_data';
 

benchmarks/SoundSplayTreeSieve/dart2/iterable.dart

@@ -1,5 +1,8 @@
 /// Marker interface for [Iterable] subclasses that have an efficient
 /// [length] implementation.
+
+// @dart=2.9
+
 abstract class EfficientLengthIterable<T> extends Iterable<T> {
   const EfficientLengthIterable();
 

benchmarks/SoundSplayTreeSieve/dart2/sound_splay_tree.dart

@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// @dart=2.9
+
 import 'dart:collection';
 import 'iterable.dart';
 

benchmarks/TypedDataDuplicate/dart2/TypedDataDuplicate.dart

@@ -4,6 +4,8 @@
 
 // Micro-benchmarks for copying typed data lists.
 
+// @dart=2.9
+
 import 'dart:typed_data';
 
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/Utf8Decode/dart2/Utf8Decode.dart

@@ -4,6 +4,8 @@
 //
 // Benchmark for UTF-8 decoding
 
+// @dart=2.9
+
 import 'dart:convert';
 import 'dart:typed_data';
 

benchmarks/Utf8Decode/dart2/datext_latin1_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String da = '''
 Anders And
 

benchmarks/Utf8Decode/dart2/entext_ascii_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String en = '''
 Anarchism
 

benchmarks/Utf8Decode/dart2/netext_3_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String ne = '''
 नेपाल
 

benchmarks/Utf8Decode/dart2/rutext_2_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String ru = '''
 Литва
 

benchmarks/Utf8Decode/dart2/sktext_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String sk = '''
 Esperanto (pôvodne Lingvo Internacia – „medzinárodný jazyk“) je najrozšírenejší medzinárodný plánový jazyk. Názov je odvodený od pseudonymu, pod ktorým v roku 1887 zverejnil lekár L. L. Zamenhof základy tohto jazyka. Zámerom tvorcu bolo vytvoriť ľahko naučiteľný a použiteľný neutrálny jazyk, vhodný na použitie v medzinárodnej komunikácii. Cieľom nebolo nahradiť národné jazyky, čo bolo neskôr aj deklarované v Boulonskej deklarácii.
 

benchmarks/Utf8Decode/dart2/zhtext_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String zh = '''
 最簡單的漢字只有一笔画，但卻不止一個字：除了「一」字以外，「乙」、「〇」、「丶」、「丨」、「亅」、「丿」、「乀」、「乁」、「𠄌」、「𠃋」、「𠃉」、「𠃊」、「乚」等都是漢字，而且都有各自的讀音。
 

benchmarks/Utf8Encode/dart2/Utf8Encode.dart

@@ -4,6 +4,8 @@
 //
 // Benchmark for UTF-8 encoding
 
+// @dart=2.9
+
 import 'dart:convert';
 
 import 'package:benchmark_harness/benchmark_harness.dart';

benchmarks/Utf8Encode/dart2/datext_latin1_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String da = '''
 Anders And
 

benchmarks/Utf8Encode/dart2/entext_ascii_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String en = '''
 Anarchism
 

benchmarks/Utf8Encode/dart2/netext_3_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String ne = '''
 नेपाल
 

benchmarks/Utf8Encode/dart2/rutext_2_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String ru = '''
 Литва
 

benchmarks/Utf8Encode/dart2/sktext_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String sk = '''
 Esperanto (pôvodne Lingvo Internacia – „medzinárodný jazyk“) je najrozšírenejší medzinárodný plánový jazyk. Názov je odvodený od pseudonymu, pod ktorým v roku 1887 zverejnil lekár L. L. Zamenhof základy tohto jazyka. Zámerom tvorcu bolo vytvoriť ľahko naučiteľný a použiteľný neutrálny jazyk, vhodný na použitie v medzinárodnej komunikácii. Cieľom nebolo nahradiť národné jazyky, čo bolo neskôr aj deklarované v Boulonskej deklarácii.
 

benchmarks/Utf8Encode/dart2/zhtext_10k.dart

@@ -7,6 +7,8 @@
 // The material is licensed under the Creative Commons Attribution-Share-Alike
 // License 3.0: https://creativecommons.org/licenses/by-sa/3.0/
 
+// @dart=2.9
+
 const String zh = '''
 最簡單的漢字只有一笔画，但卻不止一個字：除了「一」字以外，「乙」、「〇」、「丶」、「丨」、「亅」、「丿」、「乀」、「乁」、「𠄌」、「𠃋」、「𠃉」、「𠃊」、「乚」等都是漢字，而且都有各自的讀音。