Add a way to use shared CanonicalName root to deserialize Program.

pkg/kernel/test/interpreter/suite.dart

Index: pkg/kernel/test/interpreter/suite.dart
diff --git a/pkg/kernel/test/interpreter/suite.dart b/pkg/kernel/test/interpreter/suite.dart
index 4ebbe084d9cfcc36445a5e8a8e69fe045eac975b..fcd54ef964478f60cfef86bc35d0c7a08fb56cd2 100644
--- a/pkg/kernel/test/interpreter/suite.dart
+++ b/pkg/kernel/test/interpreter/suite.dart
@@ -75,7 +75,8 @@ class FastaCompile extends Step<TestDescription, Program, InterpreterContext> {
       TestDescription description, InterpreterContext context) async {
     Program platform = await context.loadPlatform();
     Ticker ticker = new Ticker();
-    DillTarget dillTarget = new DillTarget(ticker, context.uriTranslator);
+    DillTarget dillTarget = new DillTarget(null, ticker, context.uriTranslator);
+    platform.unbindCanonicalNames();
     dillTarget.loader.appendLibraries(platform);
     KernelTarget sourceTarget = new KernelTarget(PhysicalFileSystem.instance,
         dillTarget, context.uriTranslator, context.strongMode);