Implement topLevelMembers, staticMembers, instanceMembers in the VM.

tests/lib/mirrors/toplevel_members_test.dart

Index: tests/lib/mirrors/toplevel_members_test.dart
diff --git a/tests/lib/mirrors/toplevel_members_test.dart b/tests/lib/mirrors/toplevel_members_test.dart
index f79bfc05487bed3da2ec8533eea4d2280a19cd75..1fe613b0cd674c44143a02a6d3d1c210fee4e50c 100644
--- a/tests/lib/mirrors/toplevel_members_test.dart
+++ b/tests/lib/mirrors/toplevel_members_test.dart
@@ -24,29 +24,31 @@ main() {
      #libraryGetter,
      const Symbol('librarySetter='),
      #libraryMethod,
-     #_libraryVariable,
-     const Symbol('_libraryVariable='),
-     #_libraryGetter,
-     const Symbol('_librarySetter='),
-     #_libraryMethod,
+     MirrorSystem.getSymbol('_libraryVariable', lm),
+     MirrorSystem.getSymbol('_libraryVariable=', lm),
+     MirrorSystem.getSymbol('_libraryGetter', lm),
+     MirrorSystem.getSymbol('_librarySetter=', lm),
+     MirrorSystem.getSymbol('_libraryMethod', lm),
      #Predicate,
      #Superclass,
      #Interface,
      #Mixin,
-     #_PrivateClass,
+     #Class,
+     MirrorSystem.getSymbol('_PrivateClass', lm),
      #ConcreteClass],
     selectKeys(lm.topLevelMembers, (dm) => true));
 
   Expect.setEquals(
     [#libraryVariable,
      const Symbol('libraryVariable='),
-     #_libraryVariable,
-     const Symbol('_libraryVariable='),
+     MirrorSystem.getSymbol('_libraryVariable', lm),
+     MirrorSystem.getSymbol('_libraryVariable=', lm),
      #Predicate,
      #Superclass,
      #Interface,
      #Mixin,
-     #_PrivateClass,
+     #Class,
+     MirrorSystem.getSymbol('_PrivateClass', lm),
      #ConcreteClass],
     selectKeys(lm.topLevelMembers, (dm) => dm.isSynthetic));
 }