[stubs] Don't pass name to Load/StoreGlobalViaContext stubs.

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index e9579899a0f82e174e78332c1cfbdb160b8fec73..da5e506b2a4c83b88e638f555052c90d45f8986c 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -37,11 +37,9 @@ const Register StoreTransitionDescriptor::MapRegister() { return rbx; }
 
 
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return rbx; }
-const Register LoadGlobalViaContextDescriptor::NameRegister() { return rcx; }
 
 
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return rbx; }
-const Register StoreGlobalViaContextDescriptor::NameRegister() { return rcx; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return rax; }