[llvm] ConstantFold logl calls (PR #94944)

[Matthew Devereau via llvm-commits]

MDevereau wrote:

> Description is imprecise, intrinsic or libcall depends on using -fmath-errno/-fno-math-errno only. Don't mention -Ofast

I've removed -Ofast/-O3 references, thanks.

https://github.com/llvm/llvm-project/pull/94944