[SystemZ] Add ALRK, AGLRK, SLRK and SGLRK

Follows the same lines as r186686, but much more limited, since we only
use ADD LOGICAL for multi-i64 additions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186689 91177308-0d34-0410-b5e6-96231b3b80d8