* Remove silly enum values that are never going to be used
* What used to be a types "name" is now it's "description"
* Add a new iterator to type to allow users to iterate over subtypes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@426 91177308-0d34-0410-b5e6-96231b3b80d8