[ValueTracking] Make Depth last default arg (NFC) (#142384) Having a finite Depth (or recursion limit) for computeKnownBits is very limiting, but is currently a load-bearing necessity, as all KnownBits are recomputed on each call and there is no caching. As a prerequisite for an effort to remove the recursion limit altogether, either using a clever caching technique, or writing a easily-invalidable KnownBits analysis, make the Depth argument in APIs in ValueTracking uniformly the last argument with a default value. This would aid in removing the argument when the time comes, as many callers that currently pass 0 explicitly are now updated to omit the argument altogether.
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