Avoid hidden TLS access in CpuProfiler::is_profiling().

src/cpu-profiler.h

Index: src/cpu-profiler.h
diff --git a/src/cpu-profiler.h b/src/cpu-profiler.h
index e04cf855f61e4b28ad79e4abe95e584e4fd17f67..4e395271b4f952f22b3fb7ec65d51cebe78151e6 100644
--- a/src/cpu-profiler.h
+++ b/src/cpu-profiler.h
@@ -197,12 +197,12 @@ class ProfilerEventsProcessor : public Thread {
 } }  // namespace v8::internal
 
 
-#define PROFILE(isolate, Call)                         \
-  LOG(isolate, Call);                                  \
-  do {                                                 \
-    if (v8::internal::CpuProfiler::is_profiling()) {   \
-      v8::internal::CpuProfiler::Call;                 \
-    }                                                  \
+#define PROFILE(isolate, Call)                                \
+  LOG(isolate, Call);                                         \
+  do {                                                        \
+    if (v8::internal::CpuProfiler::is_profiling(isolate)) {   \
+      v8::internal::CpuProfiler::Call;                        \
+    }                                                         \
   } while (false)
 #else
 #define PROFILE(isolate, Call) LOG(isolate, Call)
@@ -261,10 +261,6 @@ class CpuProfiler {
 
   // TODO(isolates): this doesn't have to use atomics anymore.
 
-  static INLINE(bool is_profiling()) {
-    return is_profiling(Isolate::Current());
-  }
-
   static INLINE(bool is_profiling(Isolate* isolate)) {
     CpuProfiler* profiler = isolate->cpu_profiler();
     return profiler != NULL && NoBarrier_Load(&profiler->is_profiling_);
@@ -292,7 +288,7 @@ class CpuProfiler {
   Atomic32 is_profiling_;
 
 #else
-  static INLINE(bool is_profiling()) { return false; }
+  static INLINE(bool is_profiling(Isolate* isolate)) { return false; }
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
  private: