[Bug 94747] Convert phi nodes to logical operations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94747

--- Comment #1 from Jason Ekstrand <jason at jlekstrand.net> ---
The code for this already exists.  It's called nir_opt_peephole_select.  The
only problem is that it only triggers if both sides of the if are empty.  I've
been wanting to add some sort of heuristic to it for some time now.  The only
problem is that it's really back-end specific.

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