Remove keyed_store_calling convention and friends

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 2b5bcfa346269ec4380cf51194eaf1049eefcaf0..ddd1bbe4debe102fc82794faae6f3e049b1b0e76 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1126,21 +1126,12 @@ Register* PropertyAccessCompiler::store_calling_convention() {
   // receiver, name, scratch1, scratch2, scratch3.
   Register receiver = KeyedStoreIC::ReceiverRegister();
   Register name = KeyedStoreIC::NameRegister();
+  ASSERT(rbx.is(KeyedStoreIC::MapRegister()));
   static Register registers[] = { receiver, name, rbx, rdi, r8 };
   return registers;
 }
 
 
-Register* PropertyAccessCompiler::keyed_store_calling_convention() {
-  // receiver, name, scratch1/map, scratch2, scratch3.
-  Register receiver = KeyedStoreIC::ReceiverRegister();
-  Register name = KeyedStoreIC::NameRegister();
-  Register map = KeyedStoreIC::MapRegister();
-  static Register registers[] = { receiver, name, map, rdi, r8 };
-  return registers;
-}
-
-
 Register NamedStoreHandlerCompiler::value() { return StoreIC::ValueRegister(); }