iris: Flush for history at various moments

iris: Flush for history at various moments

When we blit, transfer, or copy_resource to a buffer, we need to flush
to ensure any stale data for that buffer is invalidated in the caches.

bind_history will inform us which caches need to be flushed.

Also, for any push constant buffers, we need to flag those dirty so
that we re-emit 3DSTATE_CONSTANT_*, causing the data to be re-pushed.