Add "isolate" argument to LOG macro to avoid TLS fetches.

src/log.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 58 matching lines @@
 // tick profiler requires code events, so --prof implies --log-code.
 
 // Forward declarations.
 class Ticker;
 class Profiler;
 class Semaphore;
 class SlidingStateWindow;
 class LogMessageBuilder;
 
 #undef LOG
-// TODO(isolates): pass isolate pointer here.
 #ifdef ENABLE_LOGGING_AND_PROFILING
-#define LOG(Call)                                   \
+#define LOG(isolate, Call)                          \
   do {                                              \
     v8::internal::Logger* logger =                  \
-        v8::internal::Isolate::Current()->logger(); \
+        (isolate)->logger();                        \
     if (logger->is_logging())                       \
       logger->Call;                                 \
   } while (false)
 #else
-#define LOG(Call) ((void) 0)
+#define LOG(isolate, Call) ((void) 0)
 #endif
 
 #define LOG_EVENTS_AND_TAGS_LIST(V) \
   V(CODE_CREATION_EVENT,            "code-creation")            \
   V(CODE_MOVE_EVENT,                "code-move")                \
   V(CODE_DELETE_EVENT,              "code-delete")              \
   V(CODE_MOVING_GC,                 "code-moving-gc")           \
   V(SHARED_FUNC_MOVE_EVENT,         "sfi-move")                 \
   V(SNAPSHOT_POSITION_EVENT,        "snapshot-pos")             \
   V(TICK_EVENT,                     "tick")                     \
@@ skipping 338 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_