Make sure allocated objects in PrologueCallbackAlloc and EpilogueCallbackAlloc API test are used.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/201633003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19981 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -18742,7 +18742,7 @@ void PrologueCallbackAlloc(v8::Isolate* isolate,
   SimulateFullSpace(CcTest::heap()->new_space());
 
   Local<Object> obj = Object::New(isolate);
-  ASSERT(!obj.IsEmpty());
+  CHECK(!obj.IsEmpty());
 
   CcTest::heap()->CollectAllGarbage(
       i::Heap::Heap::kAbortIncrementalMarkingMask);
@@ -18762,7 +18762,7 @@ void EpilogueCallbackAlloc(v8::Isolate* isolate,
   SimulateFullSpace(CcTest::heap()->new_space());
 
   Local<Object> obj = Object::New(isolate);
-  ASSERT(!obj.IsEmpty());
+  CHECK(!obj.IsEmpty());
 
   CcTest::heap()->CollectAllGarbage(
       i::Heap::Heap::kAbortIncrementalMarkingMask);