Support user class in compile_from_dill_test

pkg/compiler/lib/src/ssa/locals_handler.dart

Index: pkg/compiler/lib/src/ssa/locals_handler.dart
diff --git a/pkg/compiler/lib/src/ssa/locals_handler.dart b/pkg/compiler/lib/src/ssa/locals_handler.dart
index 3d0ff281544f3262bcc76c8d328fb6c736dc3f31..2d62f9131b094e085c2a2414a5a1425aeb8fd818 100644
--- a/pkg/compiler/lib/src/ssa/locals_handler.dart
+++ b/pkg/compiler/lib/src/ssa/locals_handler.dart
@@ -631,15 +631,15 @@ class LocalsHandler {
     TypeMask result = cachedTypeOfThis;
     if (result == null) {
       ThisLocal local = closureData.thisLocal;
-      ClassElement cls = local.enclosingClass;
+      ClassEntity cls = local.enclosingClass;
       if (closedWorld.isUsedAsMixin(cls)) {
         // If the enclosing class is used as a mixin, [:this:] can be
         // of the class that mixins the enclosing class. These two
         // classes do not have a subclass relationship, so, for
         // simplicity, we mark the type as an interface type.
-        result = new TypeMask.nonNullSubtype(cls.declaration, closedWorld);
+        result = new TypeMask.nonNullSubtype(cls, closedWorld);
       } else {
-        result = new TypeMask.nonNullSubclass(cls.declaration, closedWorld);
+        result = new TypeMask.nonNullSubclass(cls, closedWorld);
       }
       cachedTypeOfThis = result;
     }