Handle creating ParameterMirrors for the parameters of forwarding constructors.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 797b5235d630cf2c29a9bef0ad755aaecc19978b..1488e5f9527fa152f6077e05f9634ca4eca46c20 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -2457,8 +2457,7 @@ SequenceNode* Parser::MakeImplicitConstructor(const Function& func) {
   // expressions and then calls the respective super constructor with
   // the same name and number of parameters.
   ArgumentListNode* forwarding_args = NULL;
-  if (current_class().is_mixin_app_alias() ||
-      current_class().IsMixinApplication()) {
+  if (current_class().IsMixinApplication()) {
     // At this point we don't support forwarding constructors
     // that have optional parameters because we don't know the default
     // values of the optional parameters. We would have to compile the super
@@ -9029,7 +9028,7 @@ bool Parser::ResolveIdentInLocalScope(intptr_t ident_pos,
   // If the current class is the result of a mixin application, we must
   // use the class scope of the class from which the function originates.
   Class& cls = Class::Handle(isolate());
-  if (!current_class().IsMixinApplication()) {
+  if (!current_class().IsAnonymousMixinApplication()) {
     cls = current_class().raw();
   } else {
     cls = parsed_function()->function().origin();