Do not emit receiver map in CheckPrototypes.

src/a64/stub-cache-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 822 matching lines @@
 Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
                                        Register object_reg,
                                        Handle<JSObject> holder,
                                        Register holder_reg,
                                        Register scratch1,
                                        Register scratch2,
                                        Handle<Name> name,
                                        Label* miss,
                                        PrototypeCheckType check) {
   Handle<Map> receiver_map(IC::TypeToMap(*type, isolate()));
-  // Make sure that the type feedback oracle harvests the receiver map.
-  // TODO(svenpanne) Remove this hack when all ICs are reworked.
-  __ Mov(scratch1, Operand(receiver_map));
 
   // object_reg and holder_reg registers can alias.
   ASSERT(!AreAliased(object_reg, scratch1, scratch2));
   ASSERT(!AreAliased(holder_reg, scratch1, scratch2));
 
   // Keep track of the current object in register reg.
   Register reg = object_reg;
   int depth = 0;
 
   Handle<JSObject> current = Handle<JSObject>::null();
@@ skipping 683 matching lines @@
 
   // Miss case, call the runtime.
   __ Bind(&miss);
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64