[test] Run GC stress tests with multiple isolates.

Change-Id: I2524260703c39ca63cca49ae88620a1b70ff6d72
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/336622
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

runtime/tests/vm/dart/gc/chunked_binary_trees_array_isolates_test.dart

@@ -0,0 +1,32 @@
+// 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=
+// VMOptions=--verify_store_buffer
+// VMOptions=--verify_after_marking
+// VMOptions=--runtime_allocate_old
+// VMOptions=--runtime_allocate_spill_tlab
+// VMOptions=--no_inline_alloc
+
+// Stress test for write barrier elimination that leaves many stores with
+// eliminated barriers that create the only reference to an object in flight at
+// the same time.
+
+import "dart:isolate";
+import "chunked_binary_trees_array_test.dart" as test;
+
+child(port) {
+  test.main();
+  port.send("done");
+}
+
+main() {
+  for (var i = 0; i < 2; i++) {
+    var port;
+    port = new RawReceivePort((_) {
+      port.close();
+    });
+    Isolate.spawn(child, port.sendPort);
+  }
+}

runtime/tests/vm/dart/gc/chunked_binary_trees_isolates_test.dart

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+// 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=
+// VMOptions=--verify_store_buffer
+// VMOptions=--verify_after_marking
+// VMOptions=--runtime_allocate_old
+// VMOptions=--runtime_allocate_spill_tlab
+// VMOptions=--no_inline_alloc
+
+// Stress test for write barrier elimination that leaves many stores with
+// eliminated barriers that create the only reference to an object in flight at
+// the same time.
+
+import "dart:isolate";
+import "chunked_binary_trees_test.dart" as test;
+
+child(port) {
+  test.main();
+  port.send("done");
+}
+
+main() {
+  for (var i = 0; i < 2; i++) {
+    var port;
+    port = new RawReceivePort((_) {
+      port.close();
+    });
+    Isolate.spawn(child, port.sendPort);
+  }
+}

runtime/tests/vm/dart/gc/splay_isolates_test.dart

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+// 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.
+
+// This test is a derivative of the Splay benchmark that is run with a variety
+// of different GC options. It makes for a good GC stress test because it
+// continuously makes small changes to a large, long-lived data structure,
+// stressing lots of combinations of references between new-gen and old-gen
+// objects, and between marked and unmarked objects.
+
+// VMOptions=
+// VMOptions=--profiler --no_concurrent_mark --no_concurrent_sweep
+// VMOptions=--profiler --no_concurrent_mark --concurrent_sweep
+// VMOptions=--profiler --no_concurrent_mark --use_compactor
+// VMOptions=--profiler --no_concurrent_mark --use_compactor --force_evacuation
+// VMOptions=--profiler --concurrent_mark --no_concurrent_sweep
+// VMOptions=--profiler --concurrent_mark --concurrent_sweep
+// VMOptions=--profiler --concurrent_mark --use_compactor
+// VMOptions=--profiler --concurrent_mark --use_compactor --force_evacuation
+// VMOptions=--profiler --scavenger_tasks=0
+// VMOptions=--profiler --verify_before_gc
+// VMOptions=--profiler --verify_after_gc
+// VMOptions=--profiler --verify_before_gc --verify_after_gc
+// VMOptions=--profiler --verify_store_buffer
+// VMOptions=--profiler --verify_after_marking
+// VMOptions=--profiler --runtime_allocate_old
+// VMOptions=--profiler --runtime_allocate_spill_tlab
+// VMOptions=--profiler --no_inline_alloc
+
+import "dart:isolate";
+import "splay_test.dart" as test;
+
+void main() {
+  for (var i = 0; i < 2; i++) {
+    var port;
+    port = new RawReceivePort((_) {
+      port.close();
+    });
+    Isolate.spawn(child, port.sendPort);
+  }
+}
+
+void child(port) {
+  test.main();
+  port.send("Done");
+}