Add support for building patched_sdk and platform.dill for dart2js:

pkg/front_end/lib/src/fasta/testing/suite.dart

 // Copyright (c) 2016, 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.md file.
 
 library fasta.testing.suite;
 
 import 'dart:async' show Future;
 
 import 'dart:convert' show JSON;
 
@@ skipping 162 matching lines @@
   String get name {
     return fullCompile ? "${astKind} compile" : "outline";
   }
 
   bool get isCompiler => fullCompile;
 
   Future<Result<Program>> run(
       TestDescription description, FastaContext context) async {
     Program platform = await context.createPlatform();
     Ticker ticker = new Ticker();
-    DillTarget dillTarget = new DillTarget(ticker, context.uriTranslator);
+    DillTarget dillTarget =
+        new DillTarget(ticker, context.uriTranslator, false);
     dillTarget.loader
       ..input = Uri.parse("org.dartlang:platform") // Make up a name.
       ..setProgram(platform);
     KernelTarget sourceTarget = astKind == AstKind.Analyzer
         ? new AnalyzerTarget(dillTarget, context.uriTranslator, strongMode)
-        : new KernelTarget(dillTarget, context.uriTranslator, strongMode);
+        : new KernelTarget(
+            dillTarget, context.uriTranslator, strongMode, false);
 
     Program p;
     try {
       sourceTarget.read(description.uri);
       await dillTarget.writeOutline(null);
       ValidatingInstrumentation instrumentation;
       if (strongMode) {
         instrumentation = new ValidatingInstrumentation();
         await instrumentation.loadExpectations(description.uri);
         sourceTarget.loader.instrumentation = instrumentation;
       }
       p = await sourceTarget.writeOutline(null);
       if (fullCompile) {
         p = await sourceTarget.writeProgram(null);
         instrumentation?.finish();
         if (instrumentation != null && instrumentation.hasProblems) {
           if (updateExpectations) {
             await instrumentation.fixSource(description.uri);
           } else {
             return fail(null, instrumentation.problemsAsString);
           }
         }
       }
     } on InputError catch (e, s) {
       return fail(null, e.error, s);
     }
     return pass(p);
   }
 }