[heap] Handle edge case in NewSpaceAllocationCounter 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
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 }
 
 
 TEST(NewSpaceAllocationCounter) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
   Isolate* isolate = CcTest::i_isolate();
   Heap* heap = isolate->heap();
   size_t counter1 = heap->NewSpaceAllocationCounter();
   CcTest::CollectGarbage(NEW_SPACE);
+  CcTest::CollectGarbage(NEW_SPACE);  // Ensure new space is empty.
   const size_t kSize = 1024;
   AllocateInSpace(isolate, kSize, NEW_SPACE);
   size_t counter2 = heap->NewSpaceAllocationCounter();
   CHECK_EQ(kSize, counter2 - counter1);
   CcTest::CollectGarbage(NEW_SPACE);
   size_t counter3 = heap->NewSpaceAllocationCounter();
   CHECK_EQ(0U, counter3 - counter2);
   // Test counter overflow.
   size_t max_counter = -1;
   heap->set_new_space_allocation_counter(max_counter - 10 * kSize);
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   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