[lld] [lld] Add target support for SystemZ (s390x) (PR #75643)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

> This is a very large patch. There are quite few other large changes as well and my spare time has been scarce. It may take a while for me to come to this... and I will need to learn some SystemZ basics.

Thanks!   If you'd like to review the SystemZ specifics, you'll primarily need the ABI document here: https://github.com/IBM/s390x-abi  (you should check current mainline, which has some fixes against the latest published version - we actually noticed those bugs while implementing LLD support ...)

https://github.com/llvm/llvm-project/pull/75643