The new def-based pass works better in many cases, and should be less
resource intensive. However, the limited visibility of the defs-based
pass due to many values not being SSA yet makes it unable to fully
replace the old pass. Try the new one, and if it can't make progress,
then try the old one. That way, things will mostly be handled by the
new pass, but everything that was being cleaned up still will be.
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28666>
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