Add model test of CodegenWorldBuilder to compile_from_dill_test

tests/compiler/dart2js/equivalence/check_helpers.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.
 
 /// General equivalence test functions.
 
 library dart2js.equivalence.helpers;
 
 import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/constants/values.dart';
@@ skipping 388 matching lines @@
     print(message);
   }
 }
 
 String defaultToString(obj) => '$obj';
 
 void checkMaps(Map map1, Map map2, String messagePrefix, bool sameKey(a, b),
     bool sameValue(a, b),
     {bool failOnUnfound: true,
     bool failOnMismatch: true,
+    bool keyFilter(key),
     bool verbose: false,
     String keyToString(key): defaultToString,
     String valueToString(key): defaultToString}) {
   List<List> common = <List>[];
   List unfound = [];
   List<List> mismatch = <List>[];
-  Set remaining = computeSetDifference(map1.keys, map2.keys, common, unfound,
+
+  Iterable keys1 = map1.keys;
+  Iterable keys2 = map2.keys;
+  if (keyFilter != null) {
+    keys1 = keys1.where(keyFilter);
+    keys2 = keys2.where(keyFilter);
+  }
+  Set remaining = computeSetDifference(keys1, keys2, common, unfound,
       sameElement: sameKey, checkElements: (k1, k2) {
     var v1 = map1[k1];
     var v2 = map2[k2];
     if (!sameValue(v1, v2)) {
       mismatch.add([k1, k2]);
     }
   });
   StringBuffer sb = new StringBuffer();
   sb.write("$messagePrefix:");
   if (verbose) {
@@ skipping 44 matching lines @@
         (mismatch.isNotEmpty && failOnMismatch) ||
         remaining.isNotEmpty) {
       Expect.fail(message);
     } else {
       print(message);
     }
   } else if (verbose) {
     print(message);
   }
 }