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anv: flush the L1 cache on Xe2 after emitting 3DMESH commands

Rohan Garg requested to merge shadeslayer/mesa:review/lnl/fix_mesh_query into main

What does this MR do and why?

anv: flush the L1 cache on Xe2 after emitting 3DMESH commands

Evicting the L1 cache after each 3DMESH command seems to fix all the
mesh query tests on Xe2.
This is likely due to a WA, specifics TBD once we can find the right
one.

Fixes the following tests:
  - dEQP-VK.mesh_shader.ext.query.\*

Signed-off-by: Rohan Garg <rohan.garg@intel.com>
Edited by Rohan Garg

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