PPC: [stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

src/ppc/interface-descriptors-ppc.cc

Index: src/ppc/interface-descriptors-ppc.cc
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 1a3f3524da201cf178dfe5e3dd9486dd343a29a6..c2cb84a552380a5b020098026137926c3992af5f 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -36,12 +36,10 @@ const Register VectorStoreICDescriptor::VectorRegister() { return r6; }
 const Register StoreTransitionDescriptor::MapRegister() { return r6; }
 
 
-const Register LoadGlobalViaContextDescriptor::DepthRegister() { return r4; }
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return r5; }
 const Register LoadGlobalViaContextDescriptor::NameRegister() { return r6; }
 
 
-const Register StoreGlobalViaContextDescriptor::DepthRegister() { return r4; }
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return r5; }
 const Register StoreGlobalViaContextDescriptor::NameRegister() { return r6; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return r3; }