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

src/vm-state-inl.h

 // Copyright 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 45 matching lines @@
       UNREACHABLE();
       return NULL;
   }
 }
 
 
 VMState::VMState(Isolate* isolate, StateTag tag)
     : isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (FLAG_log_state_changes) {
-    LOG(UncheckedStringEvent("Entering", StateToString(tag)));
-    LOG(UncheckedStringEvent("From", StateToString(previous_tag_)));
+    LOG(isolate, UncheckedStringEvent("Entering", StateToString(tag)));
+    LOG(isolate, UncheckedStringEvent("From", StateToString(previous_tag_)));
   }
 #endif
 
   isolate_->SetCurrentVMState(tag);
 
 #ifdef ENABLE_HEAP_PROTECTION
   if (FLAG_protect_heap) {
     if (tag == EXTERNAL) {
       // We are leaving V8.
       ASSERT(previous_tag_ != EXTERNAL);
       isolate_->heap()->Protect();
     } else if (previous_tag_ = EXTERNAL) {
       // We are entering V8.
       isolate_->heap()->Unprotect();
     }
   }
 #endif
 }
 
 
 VMState::~VMState() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (FLAG_log_state_changes) {
-    LOG(UncheckedStringEvent("Leaving",
-                             StateToString(isolate_->current_vm_state())));
-    LOG(UncheckedStringEvent("To", StateToString(previous_tag_)));
+    LOG(isolate_,
+        UncheckedStringEvent("Leaving",
+                              StateToString(isolate_->current_vm_state())));
+    LOG(isolate_,
+        UncheckedStringEvent("To", StateToString(previous_tag_)));
   }
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 #ifdef ENABLE_HEAP_PROTECTION
   StateTag tag = isolate_->current_vm_state();
 #endif
 
   isolate_->SetCurrentVMState(previous_tag_);
 
 #ifdef ENABLE_HEAP_PROTECTION
@@ skipping 23 matching lines @@
 ExternalCallbackScope::~ExternalCallbackScope() {
   isolate_->set_external_callback(previous_callback_);
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VM_STATE_INL_H_