Handle creating ParameterMirrors for the parameters of forwarding constructors.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index d102b7845ffe64f8eeb8d936233da902c60dcd89..cb814712e5f486b7d0b438c4cc70b1c8f1c33b51 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -3189,9 +3189,6 @@ bool Class::IsMixinApplication() const {
   return mixin() != Type::null();
 }
 
-bool Class::IsAnonymousMixinApplication() const {
-  return IsMixinApplication() && !is_mixin_app_alias();
-}
 
 void Class::set_patch_class(const Class& cls) const {
   ASSERT(patch_class() == Class::null());
@@ -9067,7 +9064,7 @@ void Library::PrintToJSONStream(JSONStream* stream, bool ref) const {
     while (class_iter.HasNext()) {
       klass = class_iter.GetNextClass();
       if (!klass.IsCanonicalSignatureClass() &&
-          !klass.IsAnonymousMixinApplication()) {
+          !klass.IsMixinApplication()) {
         jsarr.AddValue(klass);
       }
     }