Implement mint unboxing on MIPS.

runtime/vm/intermediate_language_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 6525 matching lines @@
         break;
       default:
         UNREACHABLE();
     }
     return;
   }
 
   // Non constant shift value.
   Register shifter = locs()->in(1).reg();
 
-  __ mov(temp, Operand(shifter));
-  __ SmiUntag(temp);
+  __ SmiUntag(temp, shifter);
   __ CompareImmediate(temp, 0);
   // If shift value is < 0, deoptimize.
   __ b(deopt, LT);
   __ CompareImmediate(temp, kShifterLimit);
   // > kShifterLimit, result is 0.
   __ eor(out, out, Operand(out), HI);
   // Do the shift.
   switch (op_kind()) {
     case Token::kSHR:
       __ Lsr(out, left, temp, LS);
@@ skipping 345 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(R4, kInvalidObjectPointer);
   __ LoadImmediate(R5, kInvalidObjectPointer);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM