merge class extensions from patch files

test/generated_sdk/lib/collection/linked_hash_map.dart

Index: test/generated_sdk/lib/collection/linked_hash_map.dart
diff --git a/test/generated_sdk/lib/collection/linked_hash_map.dart b/test/generated_sdk/lib/collection/linked_hash_map.dart
index ecf78432e1ca951f562ef5744cbe125d17bf5831..35d011043dfa69ce44d9fdbed7c4041ba1466423 100644
--- a/test/generated_sdk/lib/collection/linked_hash_map.dart
+++ b/test/generated_sdk/lib/collection/linked_hash_map.dart
@@ -136,4 +136,14 @@ abstract class LinkedHashMap<K, V> implements HashMap<K, V> {
     Maps._fillMapWithIterables(map, keys, values);
     return map;
   }
+
+  @NoInline()
+  factory LinkedHashMap._literal(List keyValuePairs) {
+    return fillLiteralMap(keyValuePairs, new _LinkedHashMap<K, V>());
+  }
+
+  @NoThrows() @NoInline()
+  factory LinkedHashMap._empty() {
+    return new _LinkedHashMap<K, V>();
+  }
 }