[clang] [compiler-rt] [llvm] [SPARC] Properly handle CC for long double on sparc32 (PR #162226)

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koachan wrote:

Okay, I think this should be good enough for a full review, taking off the WIP tag.

> Looks okay at first glance. Take the [WIP] out of the title when you're ready for a full review.

Whoops, my bad. I meant to do it yesterday but I forgot~

https://github.com/llvm/llvm-project/pull/162226