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

[Ramkumar Ramachandra via llvm-commits]

artagnon 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?

You can split the patch into multiple independent patches, restricting this PR to just introduce the div/rem code.

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