Fix a bug in Div when all uses are truncating

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 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 1376 matching lines @@
         __ cmp(dividend, Operand(kMinInt));
         DeoptimizeIf(eq, instr->environment());
       }
       test_value = - divisor - 1;
       power = WhichPowerOf2(-divisor);
     }
 
     if (test_value != 0) {
       if (instr->hydrogen()->CheckFlag(
           HInstruction::kAllUsesTruncatingToInt32)) {
+        Label negative, done;
         __ cmp(dividend, Operand(0));
+        __ b(lt, &negative);
+        __ mov(dividend, Operand(dividend, ASR, power));
+        if (divisor < 0) __ rsb(dividend, dividend, Operand(0));
+        __ jmp(&done);
+
+        __ bind(&negative);
         __ rsb(dividend, dividend, Operand(0), LeaveCC, lt);
         __ mov(dividend, Operand(dividend, ASR, power));
-        if (divisor > 0) __ rsb(dividend, dividend, Operand(0), LeaveCC, lt);
+        if (divisor > 0) __ rsb(dividend, dividend, Operand(0));
+        __ bind(&done);
         return;  // Don't fall through to "__ rsb" below.
       } else {
         // Deoptimize if remainder is not 0.
         __ tst(dividend, Operand(test_value));
         DeoptimizeIf(ne, instr->environment());
         __ mov(dividend, Operand(dividend, ASR, power));
       }
     }
     if (divisor < 0) __ rsb(dividend, dividend, Operand(0));
 
@@ skipping 4364 matching lines @@
   __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal