anv: add a new execution mode for secondary command buffers
This change adds a call/return execution mode for secondary command buffer rather than the existing copy into the primary batch mode. v2: Rework convention to avoid burning an ALU register (Jason) v3: Use anv_address_add() (Jason) v4: Move command emissions to anv_batch_chain.c (Jason) v5: Also move last MI_BBS emission in secondary command buffer to anv_batch_chain.c (Jason) v6: Fix end secondary command buffer end (Jason) v7: Refactor anv_batch_address() to remove additional emit functions Signed-off-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net> Part-of: <mesa/mesa!2775>
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