[llvm] [LLVM] Improve the DemandedBits Analysis (PR #148853)

[Panagiotis K via llvm-commits]

karouzakisp wrote:

> Thanks for the patch! Can you split the improvements, one per operation, so we can ensure that each change has sufficient test coverage?

What do you mean split the improvements? 

https://github.com/llvm/llvm-project/pull/148853