Fix an issue in DoMulI and address mjsunit test failure.

src/arm/lithium-codegen-arm.cc

 // Copyright 2011 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 1156 matching lines @@
   Register left = ToRegister(instr->InputAt(0));
   Register right = EmitLoadRegister(instr->InputAt(1), scratch);
 
   if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero) &&
       !instr->InputAt(1)->IsConstantOperand()) {
     __ orr(ToRegister(instr->TempAt(0)), left, right);
   }
 
   if (instr->hydrogen()->CheckFlag(HValue::kCanOverflow)) {
     // scratch:left = left * right.
-    __ smull(scratch, left, left, right);
+    __ smull(left, scratch, left, right);
     __ mov(ip, Operand(left, ASR, 31));
     __ cmp(ip, Operand(scratch));
     DeoptimizeIf(ne, instr->environment());
   } else {
     __ mul(left, left, right);
   }
 
   if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
     // Bail out if the result is supposed to be negative zero.
     Label done;
@@ skipping 2217 matching lines @@
 
   DoubleRegister double_input = ToDoubleRegister(input);
   Register result_reg = ToRegister(result);
   SwVfpRegister single_scratch = double_scratch0().low();
   Register scratch1 = scratch0();
   Register scratch2 = ToRegister(instr->TempAt(0));
 
   VFPRoundingMode rounding_mode = instr->truncating() ? kRoundToMinusInf
                                                       : kRoundToNearest;
 
-
   EmitVFPTruncate(rounding_mode,
                   single_scratch,
                   double_input,
                   scratch1,
                   scratch2);
   // Deoptimize if we had a vfp invalid exception.
   DeoptimizeIf(ne, instr->environment());
   // Retrieve the result.
   __ vmov(result_reg, single_scratch);
 
@@ skipping 393 matching lines @@
 
 
 void LCodeGen::DoOsrEntry(LOsrEntry* instr) {
   Abort("DoOsrEntry unimplemented.");
 }
 
 
 #undef __
 
 } }  // namespace v8::internal