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llvmpipe: bump LP_MAX_THREADS to 32

Jeremy Rand requested to merge JeremyRand/mesa:llvmpipe-32-threads into main

On my ppc64le machine with 32 hardware threads, this speeds up OpenArena (1920x1200) from 7.2 fps to 8.1 fps.

As best I can tell, there is no documented reason for the current max being only 16, other than the commit message for 38a751cb saying that it was bumped from 8 in 2013 because someone reported a resulting speedup on a mailing list.

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