fix list_test for strong mode, and fix DDC List constructors

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

 // Copyright (c) 2015, 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.
 
 /// This library defines runtime operations on objects used by the code
 /// generator.
 part of dart._runtime;
 
 class InvocationImpl extends Invocation {
   final Symbol memberName;
@@ skipping 840 matching lines @@
     return result;
   };
   let count = $elements.length;
   let map = lookupNonTerminal($constantLists, count);
   for (let i = 0; i < count; i++) {
     map = lookupNonTerminal(map, elements[i]);
   }
   let value = map.get($elementType);
   if (value) return value;
 
-  value = $setType($elements, ${getGenericClass(JSArray)}($elementType));
-  map.set($elementType, value);
-  return value;
+  ${getGenericClass(JSArray)}($elementType).unmodifiable($elements);
+  map.set($elementType, elements);
+  return elements;
 })()''');
 
 // The following are helpers for Object methods when the receiver
 // may be null or primitive.  These should only be generated by
 // the compiler.
 hashCode(obj) {
   if (obj == null) return 0;
 
   switch (JS('String', 'typeof #', obj)) {
     case "number":
@@ skipping 120 matching lines @@
 /// Libraries are not actually deferred in DDC, so this just returns a future
 /// that completes immediately.
 Future loadLibrary() => new Future.value();
 
 /// Defines lazy statics.
 void defineLazy(to, from) {
   for (var name in getOwnNamesAndSymbols(from)) {
     defineLazyProperty(to, name, getOwnPropertyDescriptor(from, name));
   }
 }