Avoid using RecordWrite with the context (esi, rsi, cp) as...

src/x64/full-codegen-x64.cc

 // Copyright 2009 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 680 matching lines @@
         if (decl->mode() == Variable::CONST) {
           __ LoadRoot(kScratchRegister, Heap::kTheHoleValueRootIndex);
           __ movq(CodeGenerator::ContextOperand(rsi, slot->index()),
                   kScratchRegister);
           // No write barrier since the hole value is in old space.
         } else if (decl->fun() != NULL) {
           VisitForValue(decl->fun(), kAccumulator);
           __ movq(CodeGenerator::ContextOperand(rsi, slot->index()),
                   result_register());
           int offset = Context::SlotOffset(slot->index());
-          __ RecordWrite(rsi, offset, result_register(), rcx);
+          __ movq(rbx, rsi);
+          __ RecordWrite(rbx, offset, result_register(), rcx);
         }
         break;
 
       case Slot::LOOKUP: {
         __ push(rsi);
         __ Push(var->name());
         // Declaration nodes are always introduced in one of two modes.
         ASSERT(decl->mode() == Variable::VAR ||
                decl->mode() == Variable::CONST);
         PropertyAttributes attr =
@@ skipping 1172 matching lines @@
   __ movq(Operand(rsp, 0), rdx);
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal