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aco: Small improvements to buffer instructions

Timur Kristóf requested to merge Venemo/mesa:aco_buf_improvements into main

Based on !21960 (merged) so that Fossil DB stats can be collected on this MR. (Otherwise we have a crash from replaying RT shaders.)

Fix some issues that were discovered as part of the GFX11 mesh shader enablement work.

Swizzled buffer addressing seems to be broken on GFX11 when idxen=0. We don't have an explanation for this but it works if we force idxen=1 (with a zero index VGPR).

Edited by Timur Kristóf

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