[llvm] IVDescriptors: cut wasteful FAnyOf checking (NFC) (PR #118393)

[David Sherwood via llvm-commits]

david-arm wrote:

Also, I think if this patch is fixing a bug (which you implied from the commit message) then it probably shouldn't have NFC in the title or commit message? That sounds like a functional change.

https://github.com/llvm/llvm-project/pull/118393