Throw NSM on unresolved factory redirection.

pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect

Index: pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect
diff --git a/pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect b/pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect
index 49e2d423c9b7fc6d42f914e463b8add7fc2c451c..cabfbbbdd2563e017e2e044d96f63fa8371c9c5b 100644
--- a/pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect
+++ b/pkg/front_end/testcases/rasta/issue_000067.dart.direct.expect
@@ -8,7 +8,7 @@ class A extends core::Object {
   constructor •() → void
     : super core::Object::•() {}
   static factory foo() → self::A
-    let final dynamic #t1 = self::C::bar in invalid-expression;
+    let dynamic #redirecting_factory = self::C::bar in invalid-expression;
   method m() → core::int {}
 }
 class C extends self::A {
@@ -16,7 +16,7 @@ class C extends self::A {
   constructor •() → void
     : super self::A::•() {}
   static factory bar() → self::C
-    let final dynamic #t2 = self::D::• in invalid-expression;
+    let dynamic #redirecting_factory = self::D::• in invalid-expression;
   method m() → core::int {
     return 1;
   }