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

[Brad Smith via llvm-commits]

brad0 wrote:

> Aside from tests, this would also benefit from being multiple commits rather than one big change, as it's moving lots of things around and touching common code.

Last time this discussion came up MaskRay did NOT want this split up into multiple commits.

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