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anv: Apply any needed PIPE_CONTROLs before emitting state

Faith Ekstrand requested to merge gfxstrand/mesa:review/anv-flush-before-state into master

Push constants in particular can get picked up by the hardware at weird times that happen before 3DPRIMITIVE. Therefore, we need to flush before we emit all our state to ensure that any data they may pick up is in memory in time. This fixes an app which does vkCmdCopyBuffers immediately followed by a vkCmdBeginRenderPass and vkCmdDraw which uses the destination of the copy as a UBO which we push.

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