[llvm] Bfi precision (PR #66285)

[Matthias Braun via llvm-commits]

MatzeB wrote:

I don't know if the low precision is a problem for practical code. So far it was mostly annoying me when writing simple testcases that look so obvious that I expected them to just work :) It is also easy to fix those just by choosing a bigger factor there.

Are there reasons why smaller factors may be beneficial?

https://github.com/llvm/llvm-project/pull/66285