Revert "Work around ceylon/ceylon-compiler#1695"

ceylon/ceylon-compiler#1695 was fixed (thanks @FroMage!).

This reverts commit 38889454a3de3fbc67f6c5c7993e630715de226e.
Add missing case types to RedHat Type conversion

Exposed by the test that I was able to re-enable in 554cb27.