lima/ppir: Add undef handling
Add a ppir dummy node for nir_ssa_undef_instr, create a reg for it and mark it as undefined, so that regalloc can set it non-interfering to avoid register pressure.
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Equinix is shutting down its operations with us on April 30, 2025. They have graciously supported us for almost 5 years, but all good things come to an end.
Given the time frame, it's going to be hard to make a smooth transition of the cluster to somewhere else (TBD). Please expect in the next months some hiccups in the service and probably at least a full week of downtime to transfer gitlab to a different place.
All help is appreciated.
Add a ppir dummy node for nir_ssa_undef_instr, create a reg for it and mark it as undefined, so that regalloc can set it non-interfering to avoid register pressure.