[llvm] [ValueTracking] Compute knownbits for `(and/or cond0, cond1)` on both sides of branch (PR #82818)

[via llvm-commits]

goldsteinn wrote:

> @dtcxzyw Can you please rerun the tests?
> 
> @goldsteinn What's the compile-time impact?

No meaningful affect:
https://llvm-compile-time-tracker.com/compare.php?from=55bc0488af077acb47be70542718d1bc17f3de4f&to=a6a7dcd98c13617dfaf0f82614b06cc66a14694c&stat=instructions:u

https://github.com/llvm/llvm-project/pull/82818