[llvm] [ValueTracking] Compute known bits from recursive select/phi (PR #113707)

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goldsteinn wrote:

> > it would be nice if we could also use the selects compare context.
> 
> It doesn't improve anything (with +0.01% compile-time overhead). Should I drop it?

If it doesn't improve anything yeah, although IMO leave a comment explaining as much.

https://github.com/llvm/llvm-project/pull/113707