i965: Pass devinfo pointer to brw_instruction_name().

i965: Pass devinfo pointer to brw_instruction_name().

A future series will implement support for an instruction that happens
to have the same opcode number as another instruction we support
already on a disjoint set of hardware generations.  In order to
disambiguate which instruction it is brw_instruction_name() will need
some way to find out which device we are generating code for.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>