[stubs] Further optimize Load/StoreGlobalViaContext stubs.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 94b1a81667acd98c663683638cfac6bddeb19a3e..c5e104fba833372a40313ef309858a14e4d3f258 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -424,7 +424,6 @@ class LoadGlobalViaContextDescriptor : public CallInterfaceDescriptor {
                                                CallInterfaceDescriptor)
 
   static const Register SlotRegister();
-  static const Register NameRegister();
 };
 
 
@@ -434,7 +433,6 @@ class StoreGlobalViaContextDescriptor : public CallInterfaceDescriptor {
                                                CallInterfaceDescriptor)
 
   static const Register SlotRegister();
-  static const Register NameRegister();
   static const Register ValueRegister();
 };