[heap] Fix GrowAndShrinkNewSpace heap test

test/cctest/heap/test-heap.cc

 // Copyright 2012 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 2320 matching lines @@
   FLAG_predictable = true;
 
   CcTest::InitializeVM();
   Heap* heap = CcTest::heap();
   NewSpace* new_space = heap->new_space();
 
   if (heap->MaxSemiSpaceSize() == heap->InitialSemiSpaceSize()) {
     return;
   }
 
+  // Make sure we're in a consistent state to start out.
+  CcTest::CollectGarbage(NEW_SPACE);
+  CcTest::CollectGarbage(NEW_SPACE);
+
   // Explicitly growing should double the space capacity.
   size_t old_capacity, new_capacity;
   old_capacity = new_space->TotalCapacity();
   new_space->Grow();
   new_capacity = new_space->TotalCapacity();
   CHECK_EQ(2 * old_capacity, new_capacity);
 
   old_capacity = new_space->TotalCapacity();
   {
     v8::HandleScope temporary_scope(CcTest::isolate());
@@ skipping 4739 matching lines @@
   CHECK(!heap->code_space()->FirstPage()->Contains(code->address()));
 
   // Ensure it's not in large object space.
   MemoryChunk* chunk = MemoryChunk::FromAddress(code->address());
   CHECK(chunk->owner()->identity() != LO_SPACE);
   CHECK(chunk->NeverEvacuate());
 }
 
 }  // namespace internal
 }  // namespace v8