[lld] [LLD][SPARC] Implement enough functionality to run non-trivial 64-bit programs (PR #137919)

[Kirill A. Korinsky via llvm-commits]

catap wrote:

@alexrp thanks for PR which incorporate everything. I've used it as a base line for my work to build full OpenBSD/sparc64.

Here a branch: https://github.com/catap/OpenBSD-src/commits/sparc64/ it contains backport of this PR and 5 future required things which I think can be incorporated into your PR.

WIth this branch I was able to build OpenBSD/sparc64 with clang and lld as main toolchain: whole system and kernel. I haven't tried ports, but base system seems ok.

https://github.com/llvm/llvm-project/pull/137919