Fix SIMARM64 to compile on Mac, fix compilation because of ICData change.

runtime/vm/simulator_arm64.cc

 // Copyright (c) 2014, 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 <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
@@ skipping 592 matching lines @@
   dbg.Stop(instr, buffer);
   // The debugger will not be able to single step past this instruction, but
   // it will be possible to disassemble the code and inspect registers.
   FATAL("Cannot continue execution after unaligned access.");
 }
 
 
 void Simulator::UnimplementedInstruction(Instr* instr) {
   char buffer[128];
   snprintf(buffer, sizeof(buffer),
-      "Unimplemented instruction: at %p, last_pc=0x%"Px"\n",
+      "Unimplemented instruction: at %p, last_pc=0x%" Px64 "\n",
       instr, get_last_pc());
   SimulatorDebugger dbg(this);
   dbg.Stop(instr, buffer);
   FATAL("Cannot continue execution after unimplemented instruction.");
 }
 
 
 // Returns the top of the stack area to enable checking for stack pointer
 // validity.
 uword Simulator::StackTop() const {
@@ skipping 1423 matching lines @@
   int64_t return_value;
   return_value = get_register(R0);
   return return_value;
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_ARM64)
 
 #endif  // defined TARGET_ARCH_ARM64