[llvm] ValueTracking: re-use computed KnownBits (PR #111030)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

Hi @nikic, I tried a lot of things to shave the compile time before settling on this. It might not be the perfect solution, but I think it'll work. We can check LLVM Compile Time Tracker in a bit.

https://github.com/llvm/llvm-project/pull/111030