[llvm] [Semilattice] Introduce for dataflow analysis with KnownBits (PR #177616)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

I don't know what's causing it - but the make_filter_range call inside filter_range is stripping the ExcludeFn callback - leaving an Empty std::function 

https://github.com/llvm/llvm-project/pull/177616