Move all main methods to tool/.

pkg/front_end/lib/src/fasta/compile_platform.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.
 
 library fasta.compile_platform;
 
 import 'dart:async' show Future;
 
 import 'kernel/verifier.dart' show verifyProgram;
 
 import 'ticker.dart' show Ticker;
 
 import 'dart:io' show exitCode;
 
 import 'compiler_command_line.dart' show CompilerCommandLine;
 
 import 'compiler_context.dart' show CompilerContext;
 
 import 'errors.dart' show InputError;
 
 import 'kernel/kernel_target.dart' show KernelTarget;
 
 import 'dill/dill_target.dart' show DillTarget;
 
 import 'translate_uri.dart' show TranslateUri;
 
-Future main(List<String> arguments) async {
-  Ticker ticker = new Ticker();
-  try {
-    await CompilerCommandLine.withGlobalOptions("compile_platform", arguments,
-        (CompilerContext c) => compilePlatform(c, ticker));
-  } on InputError catch (e) {
-    exitCode = 1;
-    print(e.format());
-    return null;
+const int iterations = const int.fromEnvironment("iterations", defaultValue: 1);
+
+Future mainEntryPoint(List<String> arguments) async {
+  for (int i = 0; i < iterations; i++) {
+    if (i > 0) {
+      print("\n");
+    }
+    Ticker ticker = new Ticker();
+    try {
+      await CompilerCommandLine.withGlobalOptions("compile_platform", arguments,
+          (CompilerContext c) => compilePlatform(c, ticker));
+    } on InputError catch (e) {
+      exitCode = 1;
+      print(e.format());
+      return null;
+    }
   }
 }
 
 Future compilePlatform(CompilerContext c, Ticker ticker) async {
   ticker.isVerbose = c.options.verbose;
   Uri output = Uri.base.resolveUri(new Uri.file(c.options.arguments[1]));
   Uri patchedSdk = Uri.base.resolveUri(new Uri.file(c.options.arguments[0]));
   ticker.logMs("Parsed arguments");
   if (ticker.isVerbose) {
     print("Compiling $patchedSdk to $output");
@@ skipping 22 matching lines @@
       ticker.logMs("Verified program");
     } catch (e, s) {
       exitCode = 1;
       print("Verification of program failed: $e");
       if (s != null && c.options.verbose) {
         print(s);
       }
     }
   }
 }