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anv: ensure tile flush before streamout writes

Lionel Landwerlin requested to merge llandwerlin/mesa:review/anv-streamout-waw-hazard-fix into main

Streamout is not L3 coherent so previous writes to the same address might be pending and overwrite the SO writes later when they get flushed from L3, even though the SO write happened later in the batch.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Cc: mesa-stable Closes: #6680 (closed)

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