Support compilation of Hello World

pkg/compiler/lib/src/enqueue.dart

Index: pkg/compiler/lib/src/enqueue.dart
diff --git a/pkg/compiler/lib/src/enqueue.dart b/pkg/compiler/lib/src/enqueue.dart
index 8f1f1b754bc7c61da01c8572b09e3b15417fac92..f619520adef080da96da34cdac3c4a4add5f5534 100644
--- a/pkg/compiler/lib/src/enqueue.dart
+++ b/pkg/compiler/lib/src/enqueue.dart
@@ -309,7 +309,8 @@ abstract class Enqueuer {
         recentClasses.add(superclass);
         superclass.ensureResolved(resolution);
         superclass.implementation.forEachMember(processInstantiatedClassMember);
-        if (isResolutionQueue && !superclass.isSynthesized) {
+        if (isResolutionQueue &&
+            !compiler.serialization.isDeserialized(superclass)) {

[Siggi Cherem (dart-lang), 2016/04/28 17:23:15]

trying to understand this part of the change:
 - synthesized classes weren't checked before but now they are?
 - deserialized classes are not checked anymore? (is that because  they were
checked when they were built?)

[Johnni Winther, 2016/04/29 09:31:37]

All deserialized element returned `true` on [isSynthesized] which wasn't
consistent with modelx. Now have (the crude) [isDeserialized] to query instead.
(And [isSynthesized] is now consistent with modelx)

           compiler.resolver.checkClass(superclass);
         }
         // We only tell the backend once that [superclass] was instantiated, so