Adding 'isolates' argument to LOG to get rid of multiple TLS fetches in profiling.

src/stub-cache.h

 // Copyright 2006-2008 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 540 matching lines @@
                                Register scratch1,
                                Register scratch2,
                                Register scratch3,
                                String* name,
                                Label* miss);
 
   static void LookupPostInterceptor(JSObject* holder,
                                     String* name,
                                     LookupResult* lookup);
 
+  Isolate* isolate() { return scope_.isolate(); }
+
  private:
   HandleScope scope_;
   MacroAssembler masm_;
   Failure* failure_;
 };
 
 
 class LoadStubCompiler: public StubCompiler {
  public:
   MUST_USE_RESULT MaybeObject* CompileLoadNonexistent(String* name,
@@ skipping 270 matching lines @@
   MUST_USE_RESULT MaybeObject* CompileKeyedStoreStub(
       JSObject* receiver, ExternalArrayType array_type, Code::Flags flags);
 
  private:
   MaybeObject* GetCode(Code::Flags flags);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_