Refactor reifier to make it less dart_codegen specific.

test/dart_codegen/expect/collection/splay_tree.dart

 part of dart.collection;
  typedef bool _Predicate<T>(T value);
  class _SplayTreeNode<K> {final K key;
  _SplayTreeNode<K> left;
  _SplayTreeNode<K> right;
  _SplayTreeNode(K this.key);
 }
  class _SplayTreeMapNode<K, V> extends _SplayTreeNode<K> {V value;
  _SplayTreeMapNode(K key, V this.value) : super(key);
 }
@@ skipping 129 matching lines @@
  void _clear() {
 _root = null;
  _count = 0;
  _modificationCount++;
 }
 }
  class _TypeTest<T> {bool test(v) => v is T;
 }
  class SplayTreeMap<K, V> extends _SplayTree<K> implements Map<K, V> {Comparator<K> _comparator;
  _Predicate _validKey;
- SplayTreeMap([int compare(K key1, K key2), bool isValidKey(potentialKey)]) : _comparator = ((__x15) => DEVC$RT.cast(__x15, dynamic, DEVC$RT.type((__t12<K> _) {
+ SplayTreeMap([int compare(K key1, K key2), bool isValidKey(potentialKey)]) : _comparator = ((__x12) => DEVC$RT.cast(__x12, dynamic, DEVC$RT.type((Comparator<K> _) {
 }
-), "CompositeCast", """line 268, column 23 of dart:collection/splay_tree.dart: """, __x15 is __t12<K>, false))((compare == null) ? Comparable.compare : compare), _validKey = ((__x18) => DEVC$RT.cast(__x18, dynamic, __t16, "CompositeCast", """line 269, column 21 of dart:collection/splay_tree.dart: """, __x18 is __t16, false))((isValidKey != null) ? isValidKey : ((v) => v is K));
+), "CompositeCast", """line 268, column 23 of dart:collection/splay_tree.dart: """, __x12 is Comparator<K>, false))((compare == null) ? Comparable.compare : compare), _validKey = ((__x13) => DEVC$RT.cast(__x13, dynamic, DEVC$RT.type((_Predicate<dynamic> _) {
+}
+), "CompositeCast", """line 269, column 21 of dart:collection/splay_tree.dart: """, __x13 is _Predicate<dynamic>, false))((isValidKey != null) ? isValidKey : ((v) => v is K));
  factory SplayTreeMap.from(Map other, [int compare(K key1, K key2), bool isValidKey(potentialKey)]) {
 SplayTreeMap<K, V> result = new SplayTreeMap<K, V>();
  other.forEach((k, v) {
 result[k] = DEVC$RT.cast(v, dynamic, V, "CompositeCast", """line 278, column 40 of dart:collection/splay_tree.dart: """, v is V, false);
 }
 );
  return result;
 }
  factory SplayTreeMap.fromIterable(Iterable iterable, {
 K key(element), V value(element), int compare(K key1, K key2), bool isValidKey(potentialKey)}
@@ skipping 20 matching lines @@
 ), DEVC$RT.type((_SplayTreeMapNode<dynamic, dynamic> _) {
 }
 ), "AssignmentCast", """line 333, column 37 of dart:collection/splay_tree.dart: """, _root is _SplayTreeMapNode<dynamic, dynamic>, true);
  return DEVC$RT.cast(mapRoot.value, dynamic, V, "CompositeCast", """line 334, column 16 of dart:collection/splay_tree.dart: """, mapRoot.value is V, false);
 }
 }
  return null;
 }
  V remove(Object key) {
 if (!_validKey(key)) return null;
- _SplayTreeMapNode mapRoot = ((__x19) => DEVC$RT.cast(__x19, DEVC$RT.type((_SplayTreeNode<dynamic> _) {
+ _SplayTreeMapNode mapRoot = ((__x14) => DEVC$RT.cast(__x14, DEVC$RT.type((_SplayTreeNode<dynamic> _) {
 }
 ), DEVC$RT.type((_SplayTreeMapNode<dynamic, dynamic> _) {
 }
-), "AssignmentCast", """line 342, column 33 of dart:collection/splay_tree.dart: """, __x19 is _SplayTreeMapNode<dynamic, dynamic>, true))(_remove(DEVC$RT.cast(key, Object, K, "CompositeCast", """line 342, column 41 of dart:collection/splay_tree.dart: """, key is K, false)));
+), "AssignmentCast", """line 342, column 33 of dart:collection/splay_tree.dart: """, __x14 is _SplayTreeMapNode<dynamic, dynamic>, true))(_remove(DEVC$RT.cast(key, Object, K, "CompositeCast", """line 342, column 41 of dart:collection/splay_tree.dart: """, key is K, false)));
  if (mapRoot != null) return DEVC$RT.cast(mapRoot.value, dynamic, V, "CompositeCast", """line 343, column 33 of dart:collection/splay_tree.dart: """, mapRoot.value is V, false);
  return null;
 }
  void operator []=(K key, V value) {
 if (key == null) throw new ArgumentError(key);
  int comp = _splay(key);
  if (comp == 0) {
 _SplayTreeMapNode mapRoot = DEVC$RT.cast(_root, DEVC$RT.type((_SplayTreeNode<K> _) {
 }
 ), DEVC$RT.type((_SplayTreeMapNode<dynamic, dynamic> _) {
@@ skipping 177 matching lines @@
 }
  T _getValue(_SplayTreeNode node);
 }
  class _SplayTreeKeyIterable<K> extends IterableBase<K> implements EfficientLength {_SplayTree<K> _tree;
  _SplayTreeKeyIterable(this._tree);
  int get length => _tree._count;
  bool get isEmpty => _tree._count == 0;
  Iterator<K> get iterator => new _SplayTreeKeyIterator<K>(_tree);
  Set<K> toSet() {
 var setOrMap = _tree;
- SplayTreeSet<K> set = new SplayTreeSet<K>(DEVC$RT.cast(setOrMap._comparator, dynamic, DEVC$RT.type((__t20<K> _) {
+ SplayTreeSet<K> set = new SplayTreeSet<K>(DEVC$RT.cast(setOrMap._comparator, dynamic, DEVC$RT.type((__t15<K> _) {
 }
-), "CompositeCast", """line 613, column 29 of dart:collection/splay_tree.dart: """, setOrMap._comparator is __t20<K>, false), DEVC$RT.cast(setOrMap._validKey, dynamic, __t16, "CompositeCast", """line 613, column 51 of dart:collection/splay_tree.dart: """, setOrMap._validKey is __t16, false));
+), "CompositeCast", """line 613, column 29 of dart:collection/splay_tree.dart: """, setOrMap._comparator is __t15<K>, false), DEVC$RT.cast(setOrMap._validKey, dynamic, __t18, "CompositeCast", """line 613, column 51 of dart:collection/splay_tree.dart: """, setOrMap._validKey is __t18, false));
  set._count = _tree._count;
  set._root = set._copyNode(_tree._root);
  return set;
 }
 }
  class _SplayTreeValueIterable<K, V> extends IterableBase<V> implements EfficientLength {SplayTreeMap<K, V> _map;
  _SplayTreeValueIterable(this._map);
  int get length => _map._count;
  bool get isEmpty => _map._count == 0;
  Iterator<V> get iterator => new _SplayTreeValueIterator<K, V>(_map);
 }
  class _SplayTreeKeyIterator<K> extends _SplayTreeIterator<K> {_SplayTreeKeyIterator(_SplayTree<K> map) : super(map);
  K _getValue(_SplayTreeNode node) => DEVC$RT.cast(node.key, dynamic, K, "CompositeCast", """line 631, column 39 of dart:collection/splay_tree.dart: """, node.key is K, false);
 }
  class _SplayTreeValueIterator<K, V> extends _SplayTreeIterator<V> {_SplayTreeValueIterator(SplayTreeMap<K, V> map) : super(map);
  V _getValue(_SplayTreeMapNode node) => DEVC$RT.cast(node.value, dynamic, V, "CompositeCast", """line 636, column 42 of dart:collection/splay_tree.dart: """, node.value is V, false);
 }
  class _SplayTreeNodeIterator<K> extends _SplayTreeIterator<_SplayTreeNode<K>> {_SplayTreeNodeIterator(_SplayTree<K> tree) : super(tree);
  _SplayTreeNodeIterator.startAt(_SplayTree<K> tree, var startKey) : super.startAt(tree, startKey);
  _SplayTreeNode<K> _getValue(_SplayTreeNode node) => DEVC$RT.cast(node, DEVC$RT.type((_SplayTreeNode<dynamic> _) {
 }
 ), DEVC$RT.type((_SplayTreeNode<K> _) {
 }
 ), "CompositeCast", """line 644, column 55 of dart:collection/splay_tree.dart: """, node is _SplayTreeNode<K>, false);
 }
  class SplayTreeSet<E> extends _SplayTree<E> with IterableMixin<E>, SetMixin<E> {Comparator _comparator;
  _Predicate _validKey;
- SplayTreeSet([int compare(E key1, E key2), bool isValidKey(potentialKey)]) : _comparator = ((__x26) => DEVC$RT.cast(__x26, dynamic, __t23, "CompositeCast", """line 693, column 23 of dart:collection/splay_tree.dart: """, __x26 is __t23, false))((compare == null) ? Comparable.compare : compare), _validKey = ((__x27) => DEVC$RT.cast(__x27, dynamic, __t16, "CompositeCast", """line 694, column 21 of dart:collection/splay_tree.dart: """, __x27 is __t16, false))((isValidKey != null) ? isValidKey : ((v) => v is E));
+ SplayTreeSet([int compare(E key1, E key2), bool isValidKey(potentialKey)]) : _comparator = ((__x20) => DEVC$RT.cast(__x20, dynamic, DEVC$RT.type((Comparator<dynamic> _) {
+}
+), "CompositeCast", """line 693, column 23 of dart:collection/splay_tree.dart: """, __x20 is Comparator<dynamic>, false))((compare == null) ? Comparable.compare : compare), _validKey = ((__x21) => DEVC$RT.cast(__x21, dynamic, DEVC$RT.type((_Predicate<dynamic> _) {
+}
+), "CompositeCast", """line 694, column 21 of dart:collection/splay_tree.dart: """, __x21 is _Predicate<dynamic>, false))((isValidKey != null) ? isValidKey : ((v) => v is E));
  factory SplayTreeSet.from(Iterable elements, [int compare(E key1, E key2), bool isValidKey(potentialKey)]) {
 SplayTreeSet<E> result = new SplayTreeSet<E>(compare, isValidKey);
  for (final E element in DEVC$RT.cast(elements, DEVC$RT.type((Iterable<dynamic> _) {
 }
 ), DEVC$RT.type((Iterable<E> _) {
 }
 ), "CompositeCast", """line 707, column 29 of dart:collection/splay_tree.dart: """, elements is Iterable<E>, false)) {
 result.add(element);
 }
  return result;
@@ skipping 36 matching lines @@
 _addNewRoot(new _SplayTreeNode<E>(element), compare);
 }
 }
 }
  void removeAll(Iterable<Object> elements) {
 for (Object element in elements) {
 if (_validKey(element)) _remove(DEVC$RT.cast(element, Object, E, "CompositeCast", """line 767, column 39 of dart:collection/splay_tree.dart: """, element is E, false));
 }
 }
  void retainAll(Iterable<Object> elements) {
-SplayTreeSet<E> retainSet = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, __t23, DEVC$RT.type((__t28<E> _) {
+SplayTreeSet<E> retainSet = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, DEVC$RT.type((Comparator<dynamic> _) {
 }
-), "CompositeCast", """line 773, column 53 of dart:collection/splay_tree.dart: """, _comparator is __t28<E>, false), _validKey);
+), DEVC$RT.type((__t22<E> _) {
+}
+), "CompositeCast", """line 773, column 53 of dart:collection/splay_tree.dart: """, _comparator is __t22<E>, false), _validKey);
  int modificationCount = _modificationCount;
  for (Object object in elements) {
 if (modificationCount != _modificationCount) {
 throw new ConcurrentModificationError(this);
 }
  if (_validKey(object) && _splay(DEVC$RT.cast(object, Object, E, "CompositeCast", """line 781, column 39 of dart:collection/splay_tree.dart: """, object is E, false)) == 0) retainSet.add(_root.key);
 }
  if (retainSet._count != _count) {
 _root = retainSet._root;
  _count = retainSet._count;
  _modificationCount++;
 }
 }
  E lookup(Object object) {
 if (!_validKey(object)) return null;
  int comp = _splay(DEVC$RT.cast(object, Object, E, "CompositeCast", """line 793, column 23 of dart:collection/splay_tree.dart: """, object is E, false));
  if (comp != 0) return null;
  return _root.key;
 }
  Set<E> intersection(Set<E> other) {
-Set<E> result = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, __t23, DEVC$RT.type((__t28<E> _) {
+Set<E> result = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, DEVC$RT.type((Comparator<dynamic> _) {
 }
-), "CompositeCast", """line 799, column 41 of dart:collection/splay_tree.dart: """, _comparator is __t28<E>, false), _validKey);
+), DEVC$RT.type((__t22<E> _) {
+}
+), "CompositeCast", """line 799, column 41 of dart:collection/splay_tree.dart: """, _comparator is __t22<E>, false), _validKey);
  for (E element in this) {
 if (other.contains(element)) result.add(element);
 }
  return result;
 }
  Set<E> difference(Set<E> other) {
-Set<E> result = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, __t23, DEVC$RT.type((__t28<E> _) {
+Set<E> result = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, DEVC$RT.type((Comparator<dynamic> _) {
 }
-), "CompositeCast", """line 807, column 41 of dart:collection/splay_tree.dart: """, _comparator is __t28<E>, false), _validKey);
+), DEVC$RT.type((__t22<E> _) {
+}
+), "CompositeCast", """line 807, column 41 of dart:collection/splay_tree.dart: """, _comparator is __t22<E>, false), _validKey);
  for (E element in this) {
 if (!other.contains(element)) result.add(element);
 }
  return result;
 }
  Set<E> union(Set<E> other) {
 return _clone()..addAll(other);
 }
  SplayTreeSet<E> _clone() {
-var set = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, __t23, DEVC$RT.type((__t28<E> _) {
+var set = new SplayTreeSet<E>(DEVC$RT.cast(_comparator, DEVC$RT.type((Comparator<dynamic> _) {
 }
-), "CompositeCast", """line 819, column 35 of dart:collection/splay_tree.dart: """, _comparator is __t28<E>, false), _validKey);
+), DEVC$RT.type((__t22<E> _) {
+}
+), "CompositeCast", """line 819, column 35 of dart:collection/splay_tree.dart: """, _comparator is __t22<E>, false), _validKey);
  set._count = _count;
  set._root = _copyNode(_root);
  return set;
 }
  _SplayTreeNode<E> _copyNode(_SplayTreeNode<E> node) {
 if (node == null) return null;
  return new _SplayTreeNode<E>(node.key)..left = _copyNode(node.left)..right = _copyNode(node.right);
 }
  void clear() {
 _clear();
 }
  Set<E> toSet() => _clone();
  String toString() => IterableBase.iterableToFullString(this, '{', '}');
 }
- typedef int __t12<K>(K __u13, K __u14);
- typedef bool __t16(dynamic __u17);
- typedef int __t20<K>(K __u21, K __u22);
- typedef int __t23(dynamic __u24, dynamic __u25);
- typedef int __t28<E>(E __u29, E __u30);
+ typedef int __t15<K>(K __u16, K __u17);
+ typedef bool __t18(dynamic __u19);
+ typedef int __t22<E>(E __u23, E __u24);