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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

https://github.com/llvm/llvm-project/pull/107085

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