[clang] [llvm] [PowerPC] Enable indiviual crbits tracking at -O2 (PR #133617)

[Maryam Moghadas via llvm-commits]

https://github.com/maryammo commented:

Can we have a test where it shows with this PR, the backend computeFSAdditions can override the CRBits passed by frontend?

https://github.com/llvm/llvm-project/pull/133617