i965: Convert brw_eu_emit.c to the new brw_inst API.
i965: Convert brw_eu_emit.c to the new brw_inst API.

v2:
 - Fix IF -> ELSE patching on Sandybridge.
 - Don't set base_mrf on Gen6+ in OWord Block Read functions.  (Although
 - the old code did this universally, it shouldn't have - the field
 - doesn't exist on Gen6+ and just got overwritten by the SFID anyway.)

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

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