[SystemZ] Add tests for ALHSIK and ALGHSIK

The insn definitions themselves crept into r186689, sorry.
This should be the last of the distinct-ops instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186690 91177308-0d34-0410-b5e6-96231b3b80d8
Add a line that got missed off somehow. Sorry about that!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186692 91177308-0d34-0410-b5e6-96231b3b80d8