[llvm] [Mips] Fix atomic min/max generate mips4 instructions when compiling … (PR #159717)

[via llvm-commits]

yingopq wrote:

@arsenm https://github.com/llvm/llvm-project/pull/149983 broken atomic-min-max.ll test on the expensive builder. So I revert it and resubmit this PR,  could you help review again, thanks!

https://github.com/llvm/llvm-project/pull/159717