Remove keyed_store_calling convention and friends

src/arm64/ic-arm64.cc

Index: src/arm64/ic-arm64.cc
diff --git a/src/arm64/ic-arm64.cc b/src/arm64/ic-arm64.cc
index 9eadbdf9f12be70f28164d8f2603fceb43334b1e..1ed97c9d2f6bb4ff4cbbc1063cb4ebd2af380f06 100644
--- a/src/arm64/ic-arm64.cc
+++ b/src/arm64/ic-arm64.cc
@@ -532,21 +532,6 @@ const Register StoreIC::NameRegister() { return x2; }
 const Register StoreIC::ValueRegister() { return x0; }
 
 
-const Register KeyedStoreIC::ReceiverRegister() {
-  return StoreIC::ReceiverRegister();
-}
-
-
-const Register KeyedStoreIC::NameRegister() {
-  return StoreIC::NameRegister();
-}
-
-
-const Register KeyedStoreIC::ValueRegister() {
-  return StoreIC::ValueRegister();
-}
-
-
 const Register KeyedStoreIC::MapRegister() {
   return x3;
 }