Move all main methods to tool/.

pkg/front_end/lib/src/fasta/analyzer/analyzer_compile.dart

 // Copyright (c) 2017, 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 fasta.analyzer_compile;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show exitCode;
 
@@ skipping 35 matching lines @@
 
 class AnalyzerCompileTask extends CompileTask {
   AnalyzerCompileTask(CompilerContext c, Ticker ticker) : super(c, ticker);
 
   AnalyzerTarget createKernelTarget(
       DillTarget dillTarget, TranslateUri uriTranslator) {
     return new AnalyzerTarget(dillTarget, uriTranslator, c.uriToSource);
   }
 }
 
-main(List<String> arguments) async {
+mainEntryPoint(List<String> arguments) async {
   for (int i = 0; i < iterations; i++) {
     if (i > 0) {
       print("\n");
     }
     await compile(arguments);
   }
 }