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

[Alex Rønne Petersen via llvm-commits]

alexrp wrote:

If you feel like it, I definitely wouldn't say no to some help writing tests to make this mergeable; I just haven't found the time to do it yet.

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