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util, st/mesa, glthread: rewrite util thread functions, AMD cache topology code, Zen L3 optimizations

Merged Marek Olšák requested to merge mareko/mesa:zen-thread-affinity into master
  • New OS-agnostic thread affinity and getcpu functions including Windows support (@jrfonseca for awareness)
  • The L3 cache topology code was wrong, so I rewrote it from scratch to make Mesa on my AMD CPU faster. Hopefully it's right this time.
    • It could also be used on Xeons or any multi-CPU system if anybody cares.
  • I completely changed the L3 cache pinning optimization for glthread to be more effective. The old one didn't do much for me.