Remove service-compiler related code.

pkg/servicec/lib/stack.dart

-// Copyright (c) 2015, the Dartino 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 'node.dart' show
-    Node;
-
-class NodeStack {
-  List<Node> data = <Node>[];
-
-  int get size => data.length;
-
-  // Stack interface.
-  void pushNode(Node node) {
-    data.add(node);
-  }
-
-  Node popNode() {
-    return data.removeLast();
-  }
-
-  /// Returns the top of the stack or [null] if the stack is empty.
-  Node topNode() {
-    return data.isNotEmpty ? data.last : null;
-  }
-}
-
-class Popper<T extends Node> {
-  NodeStack stack;
-  Popper(this.stack);
-
-  T popNodeIfMatching() {
-    return (stack.topNode() is T) ? stack.popNode() : null;
-  }
-
-  List<T> popNodesWhileMatching() {
-    List<T> result = <T>[];
-    while (stack.topNode() is T) {
-      result.add(stack.popNode());
-    }
-    return result;
-  }
-
-  List<T> popNodes(int count) {
-    List<T> result = new List<T>(count);
-    assert(count <= stack.data.length);
-    int oldLength = stack.data.length;
-    int newLength = oldLength - count;
-    for (int i = newLength; i < oldLength; ++i) {
-      result[i - newLength] = stack.data[i];
-    }
-    stack.data.length = newLength;
-    return result;
-  }
-}