Retain maps embedded in optimized code for several garbage collections.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index d44dbaf03dc164fa7b0521cf1bb36e41643bef46..0ee53ba8abe69ff385d1f166772ac4cdd00d24d3 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -16235,6 +16235,7 @@ THREADED_TEST(SpaghettiStackReThrow) {
 TEST(Regress528) {
   v8::V8::Initialize();
   v8::Isolate* isolate = CcTest::isolate();
+  i::FLAG_retain_maps_for_n_gc = 0;
   v8::HandleScope scope(isolate);
   v8::Local<Context> other_context;
   int gc_count;