Remove --supermixin flag from VM.

tests/language/mixin_super_use_test.dart

Index: tests/language/mixin_super_use_test.dart
diff --git a/tests/language/mixin_illegal_super_use_test.dart b/tests/language/mixin_super_use_test.dart
similarity index 64%
rename from tests/language/mixin_illegal_super_use_test.dart
rename to tests/language/mixin_super_use_test.dart
index 7f0d64a39de0173b8d9520ae6c9decd24064d1d4..cd958467e19d76fbce47e73ec36d1ad0c7bb9270 100644
--- a/tests/language/mixin_illegal_super_use_test.dart
+++ b/tests/language/mixin_super_use_test.dart
@@ -9,21 +9,15 @@ class M {
 
 class P0 {
   foo() {
-    super.toString();    /// 01: compile-time error
-    super.foo();         /// 02: compile-time error
-    super.bar = 100;     /// 03: compile-time error
+    super.toString();
 
     void inner() {
-      super.toString();  /// 04: compile-time error
-      super.foo();       /// 05: compile-time error
-      super.bar = 100;   /// 06: compile-time error
+      super.toString();
     }
     inner();
 
     (() {
-      super.toString();  /// 07: compile-time error
-      super.foo();       /// 08: compile-time error
-      super.bar = 100;   /// 09: compile-time error
+      super.toString();
     })();
 
     return 42;
@@ -32,7 +26,7 @@ class P0 {
 
 class P1 {
   bar() {
-    super.toString();    /// 10: compile-time error
+    super.toString();
     return 87;
   }
 
@@ -52,7 +46,7 @@ class P1 {
 
 class P2 {
   baz() {
-    super.toString();   /// 11: compile-time error
+    super.toString();
     return 99;
   }
 }