Split dart:builtin into dart:builtin and dart:io.

runtime/bin/stdio.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
-#library("builtin");
-#import("dart:nativewrappers");
-#import("dart:coreimpl");
-
-void print(arg) {
-  _Logger._printString(arg.toString());
-}
-
-void exit(int status) {
-  if (status is !int) {
-    throw new IllegalArgumentException("int status expected");
-  }
-  _exit(status);
-}
-
 Socket _stdin;
 InputStream get stdin() {
   if (_stdin == null) {
     _stdin = new _Socket._internalReadOnly();
     _getStdioHandle(_stdin, 0);
   }
   return _stdin.inputStream;
 }
 
 Socket _stdout;
 OutputStream get stdout() {
   if (_stdout == null) {
     _stdout = new _Socket._internalWriteOnly();
     _getStdioHandle(_stdout, 1);
   }
   return _stdout.outputStream;
 }
 
 Socket _stderr;
 OutputStream get stderr() {
   if (_stderr == null) {
     _stderr = new _Socket._internalWriteOnly();
     _getStdioHandle(_stderr, 2);
   }
   return _stderr.outputStream;
 }
 
-_exit(int status) native "Exit";
-
 _getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
-
-class _Logger {
-  static void _printString(String s) native "Logger_PrintString";
-}