[llvm] [InstCombine] Fold more 'fcmp' 'select' instrs idioms into 'fabs' (PR #83381)

[Yashwant Singh via llvm-commits]

yashssh wrote:

I'm leaving this pull request open for now while simultaneously looking if I can set FMF in SROA, will return back with whatever I find.

https://github.com/llvm/llvm-project/pull/83381