[llvm] [ConstantFolding] Fold powf in single-precision. (PR #183102)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

> I don't really want to spend time reviewing changes to ConstantFolding routines given we have a plan to rewrite this code soon. Is this causing practical issues for you?

If this code is going to be changed and fixed soon, then there's no urgent need for this PR, thanks.

https://github.com/llvm/llvm-project/pull/183102