Initial implementation of interpreter for Kernel

pkg/kernel/bin/eval.dart

+#!/usr/bin/env 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.
+
+import 'package:kernel/kernel.dart';
+import 'package:kernel/interpreter/interpreter.dart';
+import 'dart:io';
+
+fail(String message) {
+  stderr.writeln(message);
+  exit(1);
+}
+
+main(List<String> args) {
+  if (args.length == 1 && args[0].endsWith('.dill')) {
+    var program = loadProgramFromBinary(args[0]);
+    new Interpreter(program).evalProgram();
+  } else {
+    return fail('One input binary file should be specified.');
+  }
+}