Add exitCode setter to set the exit code returned by the Dart VM

runtime/bin/builtin_natives.cc

 // Copyright (c) 2012, 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 "bin/builtin.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/dartutils.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 
 
 // Lists the native functions implementing basic functionality in
 // standalone dart, such as printing, file I/O, and platform information.
 // Advanced I/O classes like sockets and process management are implemented
 // using functions listed in io_natives.cc.
 #define BUILTIN_NATIVE_LIST(V)                                                 \
   V(Directory_Exists, 1)                                                       \
   V(Directory_Create, 1)                                                       \
   V(Directory_Current, 0)                                                      \
   V(Directory_CreateTemp, 1)                                                   \
   V(Directory_Delete, 2)                                                       \
   V(Directory_Rename, 2)                                                       \
   V(Directory_NewServicePort, 0)                                               \
-  V(Exit, 1)                                                                   \
   V(File_Open, 2)                                                              \
   V(File_Exists, 1)                                                            \
   V(File_Close, 1)                                                             \
   V(File_ReadByte, 1)                                                          \
   V(File_WriteByte, 2)                                                         \
   V(File_Read, 2)                                                              \
   V(File_ReadList, 4)                                                          \
   V(File_WriteList, 4)                                                         \
   V(File_Position, 1)                                                          \
   V(File_SetPosition, 2)                                                       \
@@ skipping 59 matching lines @@
   fputc('\n', out);
   fflush(out);
 }
 
 
 void FUNCTION_NAME(Logger_PrintString)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Builtin::PrintString(stdout, Dart_GetNativeArgument(args, 0));
   Dart_ExitScope();
 }
-
-
-void FUNCTION_NAME(Exit)(Dart_NativeArguments args) {
-  Dart_EnterScope();
-  int64_t status = 0;
-  // Ignore result if passing invalid argument and just exit 0.
-  DartUtils::GetInt64Value(Dart_GetNativeArgument(args, 0), &status);
-  Dart_ExitScope();
-  exit(static_cast<int>(status));
-}