These classes don't make any changes to IR and have no reason to be in
Transform/Utils. This patch moves them to Analysis folder. This will allow
us reusing these classes in some analyzes, like MustExecute.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341015 91177308-0d34-0410-b5e6-96231b3b80d8
Max Kazantsev