Move all main methods to tool/.

pkg/front_end/lib/src/fasta/outline.dart

Index: pkg/front_end/lib/src/fasta/outline.dart
diff --git a/pkg/front_end/lib/src/fasta/outline.dart b/pkg/front_end/lib/src/fasta/outline.dart
index 3d328e761903c36cee438544b8770b2135533067..0604a26958585c8e60c3ebc5888dba450261e27a 100644
--- a/pkg/front_end/lib/src/fasta/outline.dart
+++ b/pkg/front_end/lib/src/fasta/outline.dart
@@ -24,6 +24,26 @@ import 'ticker.dart' show Ticker;
 
 import 'translate_uri.dart' show TranslateUri;
 
+const int iterations = const int.fromEnvironment("iterations", defaultValue: 1);
+
+compileEntryPoint(List<String> arguments) async {
+  for (int i = 0; i < iterations; i++) {
+    if (i > 0) {
+      print("\n");
+    }
+    await compile(arguments);
+  }
+}
+
+outlineEntryPoint(List<String> arguments) async {
+  for (int i = 0; i < iterations; i++) {
+    if (i > 0) {
+      print("\n");
+    }
+    await outline(arguments);
+  }
+}
+
 Future<KernelTarget> outline(List<String> arguments) async {
   try {
     return await CompilerCommandLine.withGlobalOptions("outline", arguments,