i965/gen9: Add workarounds for object preemption.

Gen9 hardware requires some workarounds to disable preemption depending
on the type of primitive being emitted.

We implement this by adding a function that checks the primitive type
and number of instances right before the 3DPRIMITIVE.

For now, we just ignore blorp.  The only primitive it emits is
3DPRIM_RECTLIST, and since it's not listed in the workarounds, we can
safely leave preemption enabled when it happens. Or it will be disabled
by a previous 3DPRIMITIVE, which should be fine too.

v3:
 - Apply missing workarounds for instanced rendering and line loop (Ken)
 - Move workaround code to brw_draw_single_prim()

Signed-off-by: Rafael Antognolli <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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