[stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

src/arm/interface-descriptors-arm.cc

Index: src/arm/interface-descriptors-arm.cc
diff --git a/src/arm/interface-descriptors-arm.cc b/src/arm/interface-descriptors-arm.cc
index 0fd64b71bed297937c70737fc55fab673d5ee22a..5e98b98a73ef9353f2dec6e6fe884ecc3c8f019f 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -36,12 +36,10 @@ const Register VectorStoreICDescriptor::VectorRegister() { return r3; }
 const Register StoreTransitionDescriptor::MapRegister() { return r3; }
 
 
-const Register LoadGlobalViaContextDescriptor::DepthRegister() { return r1; }
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return r2; }
 const Register LoadGlobalViaContextDescriptor::NameRegister() { return r3; }
 
 
-const Register StoreGlobalViaContextDescriptor::DepthRegister() { return r1; }
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return r2; }
 const Register StoreGlobalViaContextDescriptor::NameRegister() { return r3; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return r0; }