- Add new method to dominatorset: properlyDominates
- Add synonmys for operator[] to classes so that pointers to dominator
information can be used more easily.
- Add API's to update dominator information
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3585 91177308-0d34-0410-b5e6-96231b3b80d8