Remove unused variable from keyed stores to fix 64-bit release mode....

src/x64/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 2144 matching lines @@
       Comment cmnt(masm, "[ Store to named Property");
       cgen_->frame()->Push(GetName());
       Result answer = cgen_->frame()->CallStoreIC();
       cgen_->frame()->Push(&answer);
       break;
     }
 
     case KEYED: {
       Comment cmnt(masm, "[ Store to keyed Property");
 
-      // Generate inlined version of the keyed store if the code is in
-      // a loop and the key is likely to be a smi.
-      Property* property = expression()->AsProperty();
-      ASSERT(property != NULL);
+      // TODO(x64): Implement inlined version of keyed stores.
 
-      // TODO(x64): Implement inlined version of keyed stores.
-      
       Result answer = cgen_->frame()->CallKeyedStoreIC();
       // Make sure 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 store.
       __ nop();
       cgen_->frame()->Push(&answer);
       break;
     }
 
@@ skipping 852 matching lines @@
   __ addq(rsp, Immediate(2 * kPointerSize));  // remove markers
 
   // Restore frame pointer and return.
   __ pop(rbp);
   __ ret(0);
 }
 
 #undef __
 
 } }  // namespace v8::internal