Before, we were doing this thing where we had one big relocation list for
the whole command buffer and each subbuffer took a chunk out of it. Now,
we store the actual relocation list in the anv_batch_bo. This comes at the
cost of more small allocations but makes a lot of things simpler.
Previously anv_batch.relocs was an actual relocation list. However, this
is limiting if the implementation of the batch wants to change the
relocation list as the batch progresses.
This used to happen magically in cmd_buffer_new_surface_state_bo. However,
according to Ken, STATE_BASE_ADDRESS is very gen-specific so we really
shouldn't have it in the generic data-structure code.
Jason started the task by creating anv_cmd_buffer.c and anv_cmd_emit.c.
This patch finishes the task by renaming all other files except
gen*_pack.h and glsl_scraper.py.
