KeyedLoadIC should have same register spec as LoadIC.

src/x64/lithium-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/hydrogen-osr.h"
 #include "src/lithium-allocator-inl.h"
@@ skipping 2176 matching lines @@
       // LCodeGen::DoLoadKeyedFixedArray
       instr->RequiresHoleCheck()) {
     result = AssignEnvironment(result);
   }
   return result;
 }
 
 
 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), rsi);
-  LOperand* object = UseFixed(instr->object(), KeyedLoadIC::ReceiverRegister());
-  LOperand* key = UseFixed(instr->key(), KeyedLoadIC::NameRegister());
+  LOperand* object = UseFixed(instr->object(), LoadIC::ReceiverRegister());
+  LOperand* key = UseFixed(instr->key(), LoadIC::NameRegister());
 
   LLoadKeyedGeneric* result =
       new(zone()) LLoadKeyedGeneric(context, object, key);
   return MarkAsCall(DefineFixed(result, rax), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
   ElementsKind elements_kind = instr->elements_kind();
 
@@ skipping 432 matching lines @@
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, rsi), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64