Make context register implicit for CallInterfaceDescriptors

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 7c2c362d3f0253c8f68169e21a15a50ca3aac7b1..08480defc5aab844dce00cf1096182388ed9e606 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -643,7 +643,7 @@ void HandlerStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
 }
 
 
-CallInterfaceDescriptor HandlerStub::GetCallInterfaceDescriptor() {
+CallInterfaceDescriptor HandlerStub::GetCallInterfaceDescriptor() const {
   if (kind() == Code::LOAD_IC || kind() == Code::KEYED_LOAD_IC) {
     return LoadWithVectorDescriptor(isolate());
   } else {
@@ -665,7 +665,8 @@ void ElementsTransitionAndStoreStub::InitializeDescriptor(
 }
 
 
-CallInterfaceDescriptor StoreTransitionStub::GetCallInterfaceDescriptor() {
+CallInterfaceDescriptor StoreTransitionStub::GetCallInterfaceDescriptor()
+    const {
   return StoreTransitionDescriptor(isolate());
 }