Don't let the GC clear the cache between cache invocations to pass test.

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/17218005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -16841,6 +16841,7 @@ TEST(GCCallbacks) {
 
 
 THREADED_TEST(AddToJSFunctionResultCache) {
+  i::FLAG_stress_compaction = false;
   i::FLAG_allow_natives_syntax = true;
   v8::HandleScope scope(v8::Isolate::GetCurrent());