[llvm] [SystemZ] Avoid unaligned/overlapping accesses with memcpy/memset. (PR #187100)

[Ulrich Weigand via llvm-commits]

https://github.com/uweigand commented:

I don't see any obvious reason for the build bot failures either - have you tried running on Intel yourself?

https://github.com/llvm/llvm-project/pull/187100