On SystemZ, shift and rotate instructions only use the bottom 6 bits of the shift/rotate amount.
Therefore, if the amount is ANDed with an immediate mask that has all of the bottom 6 bits set, we
can remove the AND operation entirely.
Differential Revision: http://reviews.llvm.org/D21854
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274650 91177308-0d34-0410-b5e6-96231b3b80d8
