[llvm] [PowerPC] Do not rely on MachineSink threshold to optimize CR spilling (PR #128745)

[Min-Yih Hsu via llvm-commits]

https://github.com/mshockwave commented:

Overall looks good to me. However, I'm not really familiar with the PPC instructions mentioned in this patch, could you tag some PowerPC folks to give this a look too?

https://github.com/llvm/llvm-project/pull/128745