[llvm] [InstCombineCompare] Use known bits to insert assume intrinsics. (PR #96017)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

 > What if I add a flag to explicitly enable this and have this disabled by default?

Do you mean `--enable-knowledge-retention`?

https://github.com/llvm/llvm-project/pull/96017