[compiler-rt] [compiler-rt][Mips] Fix mips SP register definition (PR #124493)

[Jens Reidel via llvm-commits]

Gelbpunkt wrote:

> Please undo reformat, or extract into a separate commit or PR

Sorry, I was following https://llvm.org/docs/Contributing.html#how-to-submit-a-patch which says to use `git clang-format HEAD~1` and amend the commit - I am a bit confused, is this not up to date anymore?

https://github.com/llvm/llvm-project/pull/124493