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

src/x64/regexp-macro-assembler-x64.cc

Index: src/x64/regexp-macro-assembler-x64.cc
diff --git a/src/x64/regexp-macro-assembler-x64.cc b/src/x64/regexp-macro-assembler-x64.cc
index 8f06d5aedafde8689f5a5d2cee3240bc79cad7ba..37d93cc53d5bb69840c534a86e2ed6fd11f5c291 100644
--- a/src/x64/regexp-macro-assembler-x64.cc
+++ b/src/x64/regexp-macro-assembler-x64.cc
@@ -955,10 +955,11 @@ Handle<Object> RegExpMacroAssemblerX64::GetCode(Handle<String> source) {
 
   CodeDesc code_desc;
   masm_->GetCode(&code_desc);
-  Handle<Code> code = FACTORY->NewCode(code_desc,
-                                       Code::ComputeFlags(Code::REGEXP),
-                                       masm_->CodeObject());
-  PROFILE(RegExpCodeCreateEvent(*code, *source));
+  Isolate* isolate = ISOLATE;
+  Handle<Code> code = isolate->factory()->NewCode(
+      code_desc, Code::ComputeFlags(Code::REGEXP),
+      masm_->CodeObject());
+  PROFILE(isolate, RegExpCodeCreateEvent(*code, *source));
   return Handle<Object>::cast(code);
 }