Get rid of unused label varaible.

src/x64/ic-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 470 matching lines @@
   __ j(not_equal, &slow);
   // Check that the value is a smi. If a conversion is needed call into the
   // runtime to convert and clamp.
   __ JumpIfNotSmi(rax, &slow);
   __ SmiToInteger32(rbx, rbx);
   __ cmpl(rbx, FieldOperand(rcx, PixelArray::kLengthOffset));
   __ j(above_equal, &slow);
   __ movq(rdx, rax);  // Save the value.
   __ SmiToInteger32(rax, rax);
   {  // Clamp the value to [0..255].
-    Label done, is_negative;
+    Label done;
     __ testl(rax, Immediate(0xFFFFFF00));
     __ j(zero, &done);
     __ setcc(negative, rax);  // 1 if negative, 0 if positive.
     __ decb(rax);  // 0 if negative, 255 if positive.
     __ bind(&done);
   }
   __ movq(rcx, FieldOperand(rcx, PixelArray::kExternalPointerOffset));
   __ movb(Operand(rcx, rbx, times_1, 0), rax);
   __ movq(rax, rdx);  // Return the original value.
   __ ret(0);
@@ skipping 507 matching lines @@
 
   // Cache miss: Jump to runtime.
   Generate(masm, ExternalReference(IC_Utility(kStoreIC_Miss)));
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal