Fix a bug in Div when all uses are truncating

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 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 1198 matching lines @@
       power = WhichPowerOf2(-divisor);
     }
 
     if (test_value != 0) {
       if (instr->hydrogen()->CheckFlag(
           HInstruction::kAllUsesTruncatingToInt32)) {
         Label done, negative;
         __ cmpl(dividend, Immediate(0));
         __ j(less, &negative, Label::kNear);
         __ sarl(dividend, Immediate(power));
+        if (divisor < 0) __ negl(dividend);
         __ jmp(&done, Label::kNear);
 
         __ bind(&negative);
         __ negl(dividend);
         __ sarl(dividend, Immediate(power));
         if (divisor > 0) __ negl(dividend);
         __ bind(&done);
         return;  // Don't fall through to "__ neg" below.
       } else {
         // Deoptimize if remainder is not 0.
@@ skipping 4281 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64