[llvm] [KnownBits] Add KnownBits::makeConstantRange to determine the known bits from a pair of unsigned lo/hi bound values (PR #107080)

[Nikita Popov via llvm-commits]

nikic wrote:

> #107085

The usage of ConstantRange there looks ok to me. But I'm also not really opposed to adding this API.

https://github.com/llvm/llvm-project/pull/107080