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freedreno/a[45]xx: skip vertex buffers which are missing a backing bo

Ilia Mirkin requested to merge imirkin/mesa:a4xx-missing-vb into main

This can happen in gl-3.1-vao-broken-attrib. We can just skip the VFD entry since it just won't have anything to write into the destination registers.

NOTE - I'm not 100% sure this is right wrt robustness -- we might be required to feed 0's in, whereas now it will just be whatever happens to be in those regs (not sure what that is). Comments welcome.

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