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965 and the mesa st disagree on how vertex elements are ordered when edgeflags are involved. 965 wants them in gl_vert_attrib order, but gallium supplies the edgeflag as the last vertex element regardless. This adds a flag which is enabled for gen4/5 to denote that the edgeflag is at the end. When we reap 965 later we can resolve this better. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Part-of: <!11146>
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