We only have a single prog_data::total_scratch for all shader variants
(SIMD 8, 16, 32). Therefore we should always max the total_scratch on
top of existing variant.
We probably haven't run into that issue before because we compile by
increasing SIMD size and higher SIMD size is more likely to spill. But
for bindless shaders with return shaders, if the last return part
doesn't spill, we completely ignore the previous parts' scratch
computation.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15193>
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