[turbofan] Optimize loads of global constants in JSTypedLowering.

src/factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 2324 matching lines @@
   store->set(JSRegExp::kIrregexpUC16CodeIndex, uninitialized);
   store->set(JSRegExp::kIrregexpLatin1CodeSavedIndex, uninitialized);
   store->set(JSRegExp::kIrregexpUC16CodeSavedIndex, uninitialized);
   store->set(JSRegExp::kIrregexpMaxRegisterCountIndex, Smi::FromInt(0));
   store->set(JSRegExp::kIrregexpCaptureCountIndex,
              Smi::FromInt(capture_count));
   regexp->set_data(*store);
 }
 
 
-Handle<Object> Factory::GlobalConstantFor(Handle<String> name) {
-  if (String::Equals(name, undefined_string())) return undefined_value();
-  if (String::Equals(name, nan_string())) return nan_value();
-  if (String::Equals(name, infinity_string())) return infinity_value();
+Handle<Object> Factory::GlobalConstantFor(Handle<Name> name) {
+  if (Name::Equals(name, undefined_string())) return undefined_value();
+  if (Name::Equals(name, nan_string())) return nan_value();
+  if (Name::Equals(name, infinity_string())) return infinity_value();
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal