Use entities in Selector methods

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 f34718b9f204ff18eb51b2200ea80fbe028de71f..157804d8d47f06eba501bde55bbe0fb0e57c9b9d 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1898,6 +1898,7 @@ class _CompilerElementEnvironment implements ElementEnvironment {
     cls.ensureResolved(_resolution);
     cls.forEachMember((ClassElement declarer, MemberElement member) {
       if (member.isSynthesized) return;
+      if (member.isMalformed) return;
       f(declarer, member);
     }, includeSuperAndInjectedMembers: true);
   }