Support (de)serialization from command-line

tests/compiler/dart2js/serialization/impact_test.dart

Index: tests/compiler/dart2js/serialization/impact_test.dart
diff --git a/tests/compiler/dart2js/serialization/impact_test.dart b/tests/compiler/dart2js/serialization/impact_test.dart
index ea1d11386aad2cb4ae8d2d0b5ddffacb09a359ff..b152cc506b7fb5c9070dede5c189175e8aa1d7a2 100644
--- a/tests/compiler/dart2js/serialization/impact_test.dart
+++ b/tests/compiler/dart2js/serialization/impact_test.dart
@@ -12,6 +12,7 @@ import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
+import 'package:compiler/src/serialization/system.dart';
 import '../memory_compiler.dart';
 import 'helper.dart';
 import 'test_helper.dart';
@@ -48,7 +49,7 @@ Future check(
       memorySourceFiles: sourceFiles,
       options: [Flags.analyzeAll]);
   compilerDeserialized.resolution.retainCachesForTesting = true;
-  deserialize(compilerDeserialized, serializedData);
+  compilerDeserialized.serialization.deserializeFromText(serializedData);
   await compilerDeserialized.run(entryPoint);
 
   checkAllImpacts(compilerNormal, compilerDeserialized, verbose: verbose);