Fix builds on Mac: icount_ is intptr_t.

runtime/vm/simulator_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 <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
@@ skipping 1960 matching lines @@
         UnimplementedInstruction(instr);
         break;
       }
     }
   }
 }
 
 
 void Simulator::InstructionDecode(Instr* instr) {
   if (IsTracingExecution()) {
-    OS::Print("%u ", icount_);
+    OS::Print("%" Pd " ", icount_);
     const uword start = reinterpret_cast<uword>(instr);
     const uword end = start + Instr::kInstrSize;
     Disassembler::Disassemble(start, end);
   }
 
   switch (instr->OpcodeField()) {
     case SPECIAL: {
       DecodeSpecial(instr);
       break;
     }
@@ skipping 495 matching lines @@
   set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception));
   set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS