[turbofan] Optimize loads of global constants in JSTypedLowering.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index b2581e38aec97aed5054959274842820dba8408c..fa3a5563e5c3714acbc74a330c54b6f3e4c36bc7 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -668,7 +668,7 @@ class Factory FINAL {
   // Returns the value for a known global constant (a property of the global
   // object which is neither configurable nor writable) like 'undefined'.
   // Returns a null handle when the given name is unknown.
-  Handle<Object> GlobalConstantFor(Handle<String> name);
+  Handle<Object> GlobalConstantFor(Handle<Name> name);
 
   // Converts the given boolean condition to JavaScript boolean value.
   Handle<Object> ToBoolean(bool value);