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anv: flush tile cache between steps of AS builds

The GRL metakernel kernels are partly implemented using the command streamer. We need to flush the tile cache + cs stall to ensure shader writes are visible by CS.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: f3ddfd81 ("anv: Build BVHs on the GPU with GRL")

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