Checked mode fixes.

dart/pkg/compiler/lib/src/scanner/class_element_parser.dart

Index: dart/pkg/compiler/lib/src/scanner/class_element_parser.dart
diff --git a/dart/pkg/compiler/lib/src/scanner/class_element_parser.dart b/dart/pkg/compiler/lib/src/scanner/class_element_parser.dart
index d1fe842c87898958e31ee274e8a033116ecefa8a..f0b0020ec86cc06886c810037a861e714acf8d4c 100644
--- a/dart/pkg/compiler/lib/src/scanner/class_element_parser.dart
+++ b/dart/pkg/compiler/lib/src/scanner/class_element_parser.dart
@@ -24,13 +24,13 @@ class PartialClassElement extends ClassElementX with PartialElement {
   }
 
   void set supertypeLoadState(int state) {
-    assert(state == supertypeLoadState + 1);
+    assert(state == STATE_NOT_STARTED || state == supertypeLoadState + 1);
     assert(state <= STATE_DONE);
     super.supertypeLoadState = state;
   }
 
   void set resolutionState(int state) {
-    assert(state == resolutionState + 1);
+    assert(state == STATE_NOT_STARTED || state == resolutionState + 1);
     assert(state <= STATE_DONE);
     super.resolutionState = state;
   }