[Bug 85505] i965/fs: Better heuristics on when to drop from SIMD16 to SIMD8, on register spilling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85505

--- Comment #2 from Petri Latvala <petri.latvala at intel.com> ---
I modified the code that discards the SIMD16 shader when it does register
spilling to instead accept it. Tested GpuTest volplosion with the resulting
Mesa.

Before (using SIMD8): frame time 244ms
After (using SIMD16, spilling): frame time 235ms

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