Throw NSM on unresolved factory redirection.

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

 library;
 import self as self;
 import "dart:core" as core;
 
 class A extends core::Object {
   static field dynamic _redirecting# = <dynamic>[self::A::foo];
   constructor •() → void
     ;
   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 {
   static field dynamic _redirecting# = <dynamic>[self::C::bar];
   constructor •() → void
     ;
   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
     ;
 }
 class D extends self::C {
   constructor •() → void
     ;
   method m() → core::int
     ;
 }
 static method main() → dynamic
   ;