Use memory source files in compile_from_dill*

tests/compiler/dart2js/kernel/compile_from_dill_test_helper.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.
 
 // Helper to test compilation equivalence between source and .dill based
 // compilation.

[Siggi Cherem (dart-lang), 2017/08/23 20:51:08]

seems like we have misnomer now - both are from source Maybe this should be
compie_via_kernel_test*?

[Johnni Winther, 2017/08/30 08:53:19]

Will do.

 library dart2js.kernel.compile_from_dill_test_helper;
 
 import 'dart:async';
 
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/types.dart';
@@ skipping 240 matching lines @@
     {bool skipWarnings: false,
     bool skipErrors: false,
     bool verbose: false,
     List<String> options: const <String>[],
     bool expectAstEquivalence: false,
     bool expectIdenticalOutput: true}) async {
   enableDebugMode();
   EnumCreator.matchKernelRepresentationForTesting = true;
   Elements.usePatchedDart2jsSdkSorting = true;
 
-  entryPoint =
-      await createTemp(entryPoint, memorySourceFiles, printSteps: true);
-
   print('---- compile from ast ----------------------------------------------');
   DiagnosticCollector collector = new DiagnosticCollector();
   OutputCollector collector1 = new OutputCollector();
   Compiler compiler1 = compilerFor(
       entryPoint: entryPoint,
+      memorySourceFiles: memorySourceFiles,
       diagnosticHandler: collector,
       outputProvider: collector1,
       options: <String>[]..addAll(commonOptions)..addAll(options));
   ElementResolutionWorldBuilder.useInstantiationMap = true;
   compiler1.resolution.retainCachesForTesting = true;
   await compiler1.run(entryPoint);
   if (collector.crashes.isNotEmpty) {
     print('Skipping due to crashes.');
     return ResultKind.crashes;
   }
   if (collector.errors.isNotEmpty && skipErrors) {
     print('Skipping due to errors.');
     return ResultKind.errors;
   }
   if (collector.warnings.isNotEmpty && skipWarnings) {
     print('Skipping due to warnings.');
     return ResultKind.warnings;
   }
   Expect.isFalse(compiler1.compilationFailed);
   ClosedWorld closedWorld1 =
       compiler1.resolutionWorldBuilder.closedWorldForTesting;
 
   OutputCollector collector2 = new OutputCollector();
   Compiler compiler2 = await compileWithDill(
       entryPoint: entryPoint,
+      memorySourceFiles: memorySourceFiles,
       options: <String>[]..addAll(commonOptions)..addAll(options),
       printSteps: true,
       compilerOutput: collector2);
 
   KernelFrontEndStrategy frontendStrategy = compiler2.frontendStrategy;
   KernelToElementMap elementMap = frontendStrategy.elementMap;
 
   Expect.isFalse(compiler2.compilationFailed);
 
   KernelEquivalence equivalence1 = new KernelEquivalence(elementMap);
@@ skipping 64 matching lines @@
       Map<String, BufferedOutputSink> map2 = collector2.outputMap[outputType];
       checkSets(map1.keys, map2.keys, 'output', equality);
       map1.forEach((String name, BufferedOutputSink output1) {
         BufferedOutputSink output2 = map2[name];
         Expect.stringEquals(output1.text, output2.text);
       });
     });
   }
   return ResultKind.success;
 }