[llvm] [NVPTX] Improve support for {ex2,lg2}.approx (PR #120519)

[Princeton Ferro via llvm-commits]

Prince781 wrote:

@Artem-B 

Also, I thought I'd ask here: do you know how I can gain write access? I emailed Chris Lattner but he didn't respond.

https://github.com/llvm/llvm-project/pull/120519