Move all main methods to tool/.

pkg/front_end/lib/src/fasta/bin/run.dart

-// Copyright (c) 2016, 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.
-
-import 'dart:io' show exit, exitCode;
-
-import '../compiler_command_line.dart' show CompilerCommandLine;
-
-import '../compiler_context.dart' show CompilerContext;
-
-import '../outline.dart' show CompileTask;
-
-import '../errors.dart' show InputError;
-
-import '../run.dart' show run;
-
-import '../ticker.dart' show Ticker;
-
-const int iterations = const int.fromEnvironment("iterations", defaultValue: 1);
-
-main(List<String> arguments) async {
-  Uri uri;
-  for (int i = 0; i < iterations; i++) {
-    await CompilerCommandLine.withGlobalOptions("run", arguments,
-        (CompilerContext c) async {
-      if (i > 0) {
-        print("\n");
-      }
-      try {
-        CompileTask task =
-            new CompileTask(c, new Ticker(isVerbose: c.options.verbose));
-        uri = await task.compile();
-      } on InputError catch (e) {
-        print(e.format());
-        exit(1);
-      }
-      if (exitCode != 0) exit(exitCode);
-      if (i + 1 == iterations) {
-        exit(await run(uri, c));
-      }
-    });
-  }
-}