Remember and reuse derived map for external arrays

src/stub-cache.cc

 // Copyright 2006-2009 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 631 matching lines @@
       PROFILE(isolate_,
           CodeCreateEvent(Logger::KEYED_EXTERNAL_ARRAY_STORE_IC_TAG,
                           Code::cast(code), 0));
     } else {
       PROFILE(isolate_,
           CodeCreateEvent(Logger::KEYED_EXTERNAL_ARRAY_LOAD_IC_TAG,
                           Code::cast(code), 0));
     }
     Object* result;
     { MaybeObject* maybe_result =
-          receiver->map()->UpdateCodeCache(name, Code::cast(code));
+          receiver->UpdateMapCodeCache(name, Code::cast(code));
       if (!maybe_result->ToObject(&result)) return maybe_result;
     }
   }
   return code;
 }
 
 
 MaybeObject* StubCache::ComputeStoreNormal(StrictModeFlag strict_mode) {
   return isolate_->builtins()->builtin((strict_mode == kStrictMode)
                             ? Builtins::StoreIC_Normal_Strict
@@ skipping 1274 matching lines @@
   }
   Code* code = Code::cast(result);
   USE(code);
   PROFILE(isolate(),
           CodeCreateEvent(Logger::STUB_TAG, code, "ExternalArrayStub"));
   return result;
 }
 
 
 } }  // namespace v8::internal