[Bug 104335] [OpenGL CTS][SKL,KBL] KHR-GL45.vertex_attrib_64bit.limits_test occasionally fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104335

--- Comment #4 from Iago Toral <itoral at igalia.com> ---
It seems that programming the hardware to include a dummy SGVS vertex element
fixes the problem.

In theory, this is not required since gen8 because 3DSTATE_VF_SGVS allows us to
store VertexID and InstanceID in an element beyond the last vertex element
programmed, but just doing this seems to get rid of the spurious fails
completely, at least on my KBL laptop.

I'll do some more testing and send an RFC patch for review if I don't find any
issues. It could be that this is just papering over something else though.

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