Serializer: Cache FlagList::Hash result.

test/cctest/test-serialize.cc

 // Copyright 2007-2010 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 1354 matching lines @@
 }
 
 
 TEST(SerializeToplevelFlagChange) {
   FLAG_serialize_toplevel = true;
 
   const char* source = "function f() { return 'abc'; }; f() + 'def'";
   v8::ScriptCompiler::CachedData* cache = ProduceCache(source);
 
   v8::Isolate* isolate2 = v8::Isolate::New();
+
   FLAG_allow_natives_syntax = true;  // Flag change should trigger cache reject.
+  FlagList::EnforceFlagImplications();
   {
     v8::Isolate::Scope iscope(isolate2);
     v8::HandleScope scope(isolate2);
     v8::Local<v8::Context> context = v8::Context::New(isolate2);
     v8::Context::Scope context_scope(context);
 
     v8::Local<v8::String> source_str = v8_str(source);
     v8::ScriptOrigin origin(v8_str("test"));
     v8::ScriptCompiler::Source source(source_str, origin, cache);
     v8::ScriptCompiler::CompileUnbound(isolate2, &source,
@@ skipping 135 matching lines @@
     v8::Local<v8::Context> context = v8::Context::New(isolate);
     delete[] data.data;  // We can dispose of the snapshot blob now.
     v8::Context::Scope c_scope(context);
     v8::Handle<v8::Function> foo =
         v8::Handle<v8::Function>::Cast(CompileRun("foo"));
     CHECK(v8::Utils::OpenHandle(*foo)->code()->is_turbofanned());
     CHECK_EQ(3, CompileRun("foo(4)")->ToInt32(isolate)->Int32Value());
   }
   isolate->Dispose();
 }