Fixes bugs in arm and mips intrinsifier.

runtime/vm/assembler_mips.h

 // 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.
 
 #ifndef VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
@@ skipping 120 matching lines @@
 
   friend class Assembler;
   DISALLOW_COPY_AND_ASSIGN(Label);
 };
 
 
 class CPUFeatures : public AllStatic {
  public:
   static void InitOnce() { }
   static bool double_truncate_round_supported() {
-    UNIMPLEMENTED();
     return false;
   }
 };
 
 
 class Assembler : public ValueObject {
  public:
   Assembler()
       : buffer_(),
         object_pool_(GrowableObjectArray::Handle()),
@@ skipping 1072 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_