[Bug 98409] 4.5% perf drop in CSDof with "nir: Optimize integer division and modulus with 1"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98409

--- Comment #3 from Matt Turner <mattst88 at gmail.com> ---
Jordan noted that I likely needed to revert

i965/cs: Use udiv/umod for local IDs
i965/cs: Don't use a thread channel ID for small local sizes

as well in order to see a difference. Indeed, I do, though it looks like the
three patches helped instruction and cycle counts in four compute shaders by
small amounts. Notably, no differences in spills or fills.

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