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

src/mips64/interface-descriptors-mips64.cc

Index: src/mips64/interface-descriptors-mips64.cc
diff --git a/src/mips64/interface-descriptors-mips64.cc b/src/mips64/interface-descriptors-mips64.cc
index 13a09c383e3e91210a970700144726968ce85725..87c8ffbc84c56b33c18db4a33afc0607a4b8cc0b 100644
--- a/src/mips64/interface-descriptors-mips64.cc
+++ b/src/mips64/interface-descriptors-mips64.cc
@@ -37,11 +37,9 @@ const Register StoreTransitionDescriptor::MapRegister() { return a3; }
 
 
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return a2; }
-const Register LoadGlobalViaContextDescriptor::NameRegister() { return a3; }
 
 
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return a2; }
-const Register StoreGlobalViaContextDescriptor::NameRegister() { return a3; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return a0; }