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brw: add more conditions for reducing sampler simdness

Lionel Landwerlin requested to merge llandwerlin/mesa:review/brw-sampler-message-lowering-fix into main

What does this MR do and why?

brw: add more condition for reducing sampler simdness

Running
KHR-GL46.sparse_texture_clamp_tests.SparseTextureClampLookupColor test
with Zink on Anv we run into an assert :

assert(inst->mlen <= MAX_SAMPLER_MESSAGE_SIZE * reg_unit(devinfo));

Turns out we've not covered all the cases in the SIMD lowering.

It's a bit of a shame to have both files reproduce the same logic.
Will try to think of a better way to extract the layout of the a send
message but that'll be a much bigger rework.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable

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