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lima/ppir: use ra_get_best_spill_node to select spill node

Erico Nunes requested to merge enunes/mesa:lima-ppir-ra-best-spill-node into master

ra_get_best_spill_node is what other users of the mesa register allocator use. Switching to it now also fixes an infinite loop issue with ppir regalloc with the ppir control flow patchset, and also provides a small gain over the previous herusitic on number of spilled nodes testing with shader-db.

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