[clang] [Driver][Sparc] Default to -mcpu=v9 for 32-bit Linux/sparc64 (PR #109278)

[John Paul Adrian Glaubitz via cfe-commits]

glaubitz wrote:

> Just to be certain: the revised version of the patch is ok to commit?

I think it would be good to get an ACK from at least one of the SPARC Leon maintainers.

CC @andreas-gaisler

https://github.com/llvm/llvm-project/pull/109278