SystemZ: Add sincos intrinsic test (#147473)
The ZOS run line is mostly broken. update_test_checks seems
to not work on it and I have no idea what I'm looking at here.
It's not obvious to me what the calls are. I added some checks
for the references to the libcalls printed at the end of the module,
but didn't check anything in the function body. half also just
asserts somewhere.
