[turbofan] Optimize loads of global constants in JSTypedLowering.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 8fe765d9e2a9b785fa300a4695d5f01fa3288ac8..a33f288ccbe7dfd2457f4350e2815930c5784a0e 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -2342,10 +2342,10 @@ void Factory::SetRegExpIrregexpData(Handle<JSRegExp> regexp,
 }
 
 
-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();
 }