[clang] [Sparc] Add flags to enable errata workaround pass for GR712RC and UT700 (PR #104742)

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koachan wrote:

> We have also developed some performance related patches for the Sparc backend, but it has been difficult to get them upstreamed as, as you say, few people are working on the Sparc backend.

This is off-topic but is it possible for you to submit it (or if I can see those)? I'd like to get them upstreamed, if possible~

https://github.com/llvm/llvm-project/pull/104742