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

[Ramkumar Ramachandra via llvm-commits]

artagnon 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

Thanks Simon, that's helpful: I think that maybe capturing the std::function by ref isn't working: I've pushed a fix to capture by value, which hopefully fixes the issue.

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