[lldb] [llvm] [SPARC] Make SPARC_REGISTER Sparc specific in llvm-readobj and LLDB (PR #206316)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

Please reference the commit not the PR that this fixes, and I don't see why the commit message that's going to be baked into the repo's history should mention that it's been split out from another PR? That's reviewer context for today, not those looking at the commit history.

https://github.com/llvm/llvm-project/pull/206316