Adds intrinsics for arm64.

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 593 matching lines @@
   }
 }
 
 
 // Get the register from the architecture state.
 int32_t Simulator::get_wregister(Register reg, R31Type r31t) const {
   ASSERT((reg >= 0) && (reg < kNumberOfCpuRegisters));
   if ((reg == R31) && (r31t == R31IsZR)) {
     return 0;
   } else {
-    return registers_[reg];
+    return static_cast<int32_t>(registers_[reg]);
   }
 }
 
 
 int64_t Simulator::get_vregisterd(VRegister reg) const {
   ASSERT((reg >= 0) && (reg < kNumberOfVRegisters));
   return vregisters_[reg].lo;
 }
 
 
@@ skipping 1848 matching lines @@
   set_register(kExceptionObjectReg, bit_cast<int64_t>(raw_exception));
   set_register(kStackTraceObjectReg, bit_cast<int64_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_ARM64)
 
 #endif  // defined TARGET_ARCH_ARM64