Fixes integer negate intrinsic for arm and mips.

runtime/vm/intrinsifier_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 777 matching lines @@
   __ Ret();
   __ delay_slot()->SmiTag(V0);
   __ Bind(&fall_through);
   return false;
 }
 
 
 bool Intrinsifier::Integer_negate(Assembler* assembler) {
   Label fall_through;
 
-  __ lw(V0, Address(SP, + 0 * kWordSize));  // Grabs first argument.
-  __ andi(CMPRES, V0, Immediate(kSmiTagMask));  // Test for Smi.
+  __ lw(T0, Address(SP, + 0 * kWordSize));  // Grabs first argument.
+  __ andi(CMPRES, T0, Immediate(kSmiTagMask));  // Test for Smi.
   __ bne(CMPRES, ZR, &fall_through);  // Fall through if not a Smi.
+  __ SubuDetectOverflow(V0, ZR, T0, CMPRES);
+  __ bltz(CMPRES, &fall_through);  // There was overflow.
   __ Ret();
-  __ delay_slot()->subu(V0, ZR, V0);
   __ Bind(&fall_through);
   return false;
 }
 
 
 bool Intrinsifier::Integer_bitAndFromInteger(Assembler* assembler) {
   Label fall_through;
 
   TestBothArgumentsSmis(assembler, &fall_through);  // Checks two smis.
   __ Ret();
@@ skipping 956 matching lines @@
   __ Bind(&ok);
   __ Ret();
 
   __ Bind(&fall_through);
   return false;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS