Collect garbage before serializing heap in test-serialize

test/cctest/test-serialize.cc

 // Copyright 2007-2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 238 matching lines @@
 static void Serialize() {
   // We have to create one context.  One reason for this is so that the builtins
   // can be loaded from v8natives.js and their addresses can be processed.  This
   // will clear the pending fixups array, which would otherwise contain GC roots
   // that would confuse the serialization/deserialization process.
   v8::Isolate* isolate = CcTest::isolate();
   {
     v8::HandleScope scope(isolate);
     v8::Context::New(isolate);
   }
-  WriteToFile(reinterpret_cast<Isolate*>(isolate),
-              FLAG_testing_serialization_file);
+
+  Isolate* internal_isolate = CcTest::i_isolate();
+  internal_isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags, "serialize");
+  WriteToFile(internal_isolate, FLAG_testing_serialization_file);
 }
 
 
 // Test that the whole heap can be serialized.
 UNINITIALIZED_TEST(Serialize) {
   if (!Snapshot::HaveASnapshotToStartFrom()) {
     Serializer::Enable(CcTest::i_isolate());
     v8::V8::Initialize();
     Serialize();
   }
@@ skipping 369 matching lines @@
 TEST(TestThatAlwaysFails) {
   bool ArtificialFailure = false;
   CHECK(ArtificialFailure);
 }
 
 
 DEPENDENT_TEST(DependentTestThatAlwaysFails, TestThatAlwaysSucceeds) {
   bool ArtificialFailure2 = false;
   CHECK(ArtificialFailure2);
 }