KeyedLoadIC should have same register spec as LoadIC.

src/x64/builtins-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/codegen.h"
 #include "src/deoptimizer.h"
@@ skipping 1048 matching lines @@
     __ movp(rbx,
             Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
     __ movp(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
 
     // Push the receiver.
     __ bind(&push_receiver);
     __ Push(rbx);
 
     // Copy all arguments from the array to the stack.
     Label entry, loop;
-    __ movp(rax, Operand(rbp, kIndexOffset));
+    Register receiver = LoadIC::ReceiverRegister();
+    Register key = LoadIC::NameRegister();
+    __ movp(key, Operand(rbp, kIndexOffset));
     __ jmp(&entry);
     __ bind(&loop);
-    __ movp(rdx, Operand(rbp, kArgumentsOffset));  // load arguments
+    __ movp(receiver, Operand(rbp, kArgumentsOffset));  // load arguments
 
     // Use inline caching to speed up access to arguments.
     Handle<Code> ic =
         masm->isolate()->builtins()->KeyedLoadIC_Initialize();
     __ Call(ic, RelocInfo::CODE_TARGET);
     // It is important that we do not have a test instruction after the
     // call.  A test instruction after the call is used to indicate that
     // we have generated an inline version of the keyed load.  In this
     // case, we know that we are not generating a test instruction next.
 
     // Push the nth argument.
     __ Push(rax);
 
-    // Update the index on the stack and in register rax.
-    __ movp(rax, Operand(rbp, kIndexOffset));
-    __ SmiAddConstant(rax, rax, Smi::FromInt(1));
-    __ movp(Operand(rbp, kIndexOffset), rax);
+    // Update the index on the stack and in register key.
+    __ movp(key, Operand(rbp, kIndexOffset));
+    __ SmiAddConstant(key, key, Smi::FromInt(1));
+    __ movp(Operand(rbp, kIndexOffset), key);
 
     __ bind(&entry);
-    __ cmpp(rax, Operand(rbp, kLimitOffset));
+    __ cmpp(key, Operand(rbp, kLimitOffset));
     __ j(not_equal, &loop);
 
     // Call the function.
     Label call_proxy;
     ParameterCount actual(rax);
-    __ SmiToInteger32(rax, rax);
+    __ SmiToInteger32(rax, key);
     __ movp(rdi, Operand(rbp, kFunctionOffset));
     __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
     __ j(not_equal, &call_proxy);
     __ InvokeFunction(rdi, actual, CALL_FUNCTION, NullCallWrapper());
 
     frame_scope.GenerateLeaveFrame();
     __ ret(3 * kPointerSize);  // remove this, receiver, and arguments
 
     // Call the function proxy.
     __ bind(&call_proxy);
@@ skipping 404 matching lines @@
   __ bind(&ok);
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64