Replace "check:" wth "CHECK:".
Also fix one test by changing "vpermilps" to "vpshufd".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175357 91177308-0d34-0410-b5e6-96231b3b80d8
Add even more constatness in MachineDominators.h.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175358 91177308-0d34-0410-b5e6-96231b3b80d8