In constant evaluation, properly handle redirecting factory constructors.

tests/language/switch_case_test.dart

Index: tests/language/switch_case_test.dart
diff --git a/tests/language/switch_case_test.dart b/tests/language/switch_case_test.dart
index 60c150e4853e38f760342f1fc966f5c051f9a4d6..15a57ba28bdd2c066546e07fbc5c300a74e96ef3 100644
--- a/tests/language/switch_case_test.dart
+++ b/tests/language/switch_case_test.dart
@@ -24,6 +24,7 @@ class C implements A {
 }
 
 class D implements C {
+  int get x => 0;

[Brian Wilkerson, 2014/05/06 21:44:32]

I don't know enough about this test to know whether the absence of this line was
significant (although I admit it seems unlikely in this case). We should
probably get the author to review the change.

   const factory D() = C.fromD;
 }