draw: handle primitive ID for quads/quad strips.

draw: handle primitive ID for quads/quad strips.

In order to enable compat contexts QUADS/QUAD_STRIPS need
to support primitive ID. There are some piglit tests for this.

This adds support to the decomposer to pass quads so the prim
assembler can pick them up and add primitive IDs.

Acked-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12374>