[VM/Service] Add test that steps through an inline class method call with the debugger

TEST=CI

Fixes https://github.com/dart-lang/sdk/issues/49746
Change-Id: I2637efeb53856466a47611b28a91d5d6828ecdc5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292380
Commit-Queue: Derek Xu <derekx@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>

pkg/vm_service/test/step_through_inline_class_method_call_test.dart

@@ -0,0 +1,71 @@
+// Copyright (c) 2023, the Dart project authors. Please see the AUTHORS file
+// 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.
+
+// VMOptions=--enable-experiment=inline-class
+// @dart=3.0
+// ignore_for_file: experiment_not_enabled
+
+import 'package:test/test.dart';
+import 'package:vm_service/vm_service.dart';
+
+import 'common/service_test_common.dart';
+import 'common/test_helper.dart';
+
+const int testMainStartLine = 27;
+const int inlineClassDefinitionStartLine = 19;
+const String fileName = 'step_through_inline_class_method_call_test.dart';
+
+inline class IdNumber {
+  final int i;
+
+  IdNumber(this.i);
+
+  operator <(IdNumber other) => i < other.i;
+}
+
+testMain() {
+  IdNumber id1 = IdNumber(123);
+  IdNumber id2 = IdNumber(999);
+  id1 < id2;
+}
+
+List<String> stops = [];
+
+List<String> expected = [
+  '$fileName:${testMainStartLine + 0}:9', // on '()'
+  '$fileName:${testMainStartLine + 1}:18', // on 'IdNumber'
+  '$fileName:${testMainStartLine + 2}:18', // on 'IdNumber'
+  '$fileName:${testMainStartLine + 3}:7', // on '<'
+  '$fileName:${inlineClassDefinitionStartLine + 5}:23', // on 'other'
+  '$fileName:${inlineClassDefinitionStartLine + 5}:35', // on '<'
+  '$fileName:${inlineClassDefinitionStartLine + 5}:33', // on 'i'
+  '$fileName:${testMainStartLine + 4}:1', // on closing '}' of [testMain]
+];
+
+final tests = <IsolateTest>[
+  hasPausedAtStart,
+  setBreakpointAtLine(testMainStartLine),
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    final isolate = await service.getIsolate(isolateId);
+    final Library rootLib =
+        (await service.getObject(isolateId, isolate.rootLib!.id!)) as Library;
+    final FuncRef function =
+        rootLib.functions!.firstWhere((f) => f.name == 'IdNumber|<');
+    expect(function, isNotNull);
+    await service.addBreakpointAtEntry(isolateId, function.id!);
+  },
+  runStepThroughProgramRecordingStops(stops),
+  checkRecordedStops(stops, expected),
+];
+
+main(args) => runIsolateTestsSynchronous(
+      args,
+      tests,
+      fileName,
+      testeeConcurrent: testMain,
+      extraArgs: extraDebuggingArgs,
+      pause_on_start: true,
+      pause_on_exit: true,
+    );