i965: Relax restriction on scheduling last instruction.
I think when this code was written, basic blocks were always ended by a control flow instruction or an end-of-thread message. That's no longer the case, and removing this restriction actually helps things: instructions in affected programs: 7267 -> 7244 (-0.32%) helped: 4 total cycles in shared programs: 66559580 -> 66431900 (-0.19%) cycles in affected programs: 28310152 -> 28182472 (-0.45%) helped: 9577 HURT: 879 GAINED: 2 The addition of the is_control_flow() checks is not a functional change, since the add_insts_from_block() does not put them in the list of instructions to schedule. I plan to change this in a later patch. Reviewed-by: Francisco Jerez <firstname.lastname@example.org>
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