Remove invalidated elements from enqueuer and resolution.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index bc7dfe0e3982787e6b721aac2a3806c6eb67e300..007f984337bc6dd69d0eec8325ff602d33fe20e6 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1208,6 +1208,7 @@ abstract class Compiler implements LibraryLoaderListener {
   }
 
   void forgetElement(Element element) {
+    resolution.forgetElement(element);
     enqueuer.forgetElement(element);
     if (element is MemberElement) {
       for (Element closure in element.nestedClosures) {
@@ -1976,6 +1977,12 @@ class _CompilerResolution implements Resolution {
       return new ResolutionWorkItem(element, compilationContext);
     }
   }
+
+  @override
+  void forgetElement(Element element) {
+    _worldImpactCache.remove(element);
+    _resolutionImpactCache.remove(element);
+  }
 }
 
 class GlobalDependencyRegistry extends EagerRegistry {