Make gen files more human-readable by using a string initializer

Make gen files more human-readable by using a string initializer
instead of an integer array initializer.

For example, the initializer in builtin_gen.cc now looks something like this:

const char Builtin::builtin_source_[] =
 
  // ----- bin/builtin.dart -----

  "// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file\n"
  "// for details. All rights reserved. Use of this source code is governed by a\n"
  "// BSD-style license that can be found in the LICENSE file.\n"
  "\n"
  "#library(\"builtin\");\n"
  "#import(\"dart:nativewrappers\");\n"
  "#import(\"dart:coreimpl\");\n"
  "\n"
  "void print(arg) {\n"
  "  _Logger._printString(arg.toString());\n" /* L10 */
  "}\n"
  "\n"
  "void exit(int status) {\n"
  "  if (status is !int) {\n"
  "    throw new IllegalArgumentException(\"int status expected\");\n"
  "  }\n"
  "  _exit(status);\n"
  "}\n"
  "\n"
  "_exit(int status) native \"Exit\";\n" /* L20 */
  "\n"
  "class _Logger {\n"
  "  static void _printString(String s) native \"Logger_PrintString\";\n"
  "}\n"

;
Committed: https://code.google.com/p/dart/source/detail?r=4280

[siva, 2012-02-15 18:52:40]

LGTM

Is there any impact on the size of the dart VM library because of this?