anv: fix xfb usage with rasterizer discard
in the initial implementation, a stream like: * CmdBeginTransformFeedbackEXT * CmdSetRasterizerDiscardEnableEXT * CmdDraw * CmdEndTransformFeedbackEXT * CmdBeginTransformFeedbackEXT * CmdDraw * CmdEndTransformFeedbackEXT would never enable transform feedback, as it only checked for the change in rasterizer_discard state Fixes: 4d531c67 ("anv: support rasterizer discard dynamic state") Reviewed-by:Jason Ekstrand <jason.ekstrand@collabora.com> Part-of: <mesa/mesa!15269> (cherry picked from commit 52f69784)
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