[Mesa-dev] V8 Loop unrolling in NIR

[Timothy Arceri]

V8:
 - bunch of tidy ups mostly suggestions from Jason.
 - fixed some regressions since V6 caused by V7 handling less
   trivial loops. Piglit tests sent to cover these cases.

New piglit tests:
https://patchwork.freedesktop.org/patch/129066/

This series seems to regress some Vulkan CTS tests but I assume
jasons series will take care of those? I haven't tested that,
I haven't been seeing jenkins results from the Vulkan CTS until
today.