intel/compiler: Silence unused parameter warnings in release builds

intel/compiler: Silence unused parameter warnings in release builds

Reduces my build from 7005 warnings to 6451 warnings by silencing 554
instances of

In file included from ../../SOURCE/master/src/intel/compiler/brw_disasm.c:28:0:
../../SOURCE/master/src/intel/compiler/brw_inst.h: In function ‘brw_inst_3src_a1_src0_imm’:
../../SOURCE/master/src/intel/compiler/brw_inst.h:346:57: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_inst_3src_a1_src0_imm(const struct gen_device_info *devinfo,
                                                         ^~~~~~~
../../SOURCE/master/src/intel/compiler/brw_inst.h: In function ‘brw_inst_3src_a1_src2_imm’:
../../SOURCE/master/src/intel/compiler/brw_inst.h:354:57: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_inst_3src_a1_src2_imm(const struct gen_device_info *devinfo,
                                                         ^~~~~~~
../../SOURCE/master/src/intel/compiler/brw_inst.h: In function ‘brw_inst_set_3src_a1_src0_imm’:
../../SOURCE/master/src/intel/compiler/brw_inst.h:362:61: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_inst_set_3src_a1_src0_imm(const struct gen_device_info *devinfo,
                                                             ^~~~~~~
../../SOURCE/master/src/intel/compiler/brw_inst.h: In function ‘brw_inst_set_3src_a1_src2_imm’:
../../SOURCE/master/src/intel/compiler/brw_inst.h:370:61: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_inst_set_3src_a1_src2_imm(const struct gen_device_info *devinfo,
                                                             ^~~~~~~
../../SOURCE/master/src/intel/compiler/brw_inst.h: In function ‘brw_inst_imm_uq’:
../../SOURCE/master/src/intel/compiler/brw_inst.h:703:47: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_inst_imm_uq(const struct gen_device_info *devinfo, const brw_inst *insn)
                                               ^~~~~~~
In file included from ../../SOURCE/master/src/intel/compiler/brw_shader.h:29:0,
                 from ../../SOURCE/master/src/intel/compiler/brw_disasm.c:29:
../../SOURCE/master/src/intel/compiler/brw_compiler.h: In function ‘brw_stage_has_packed_dispatch’:
../../SOURCE/master/src/intel/compiler/brw_compiler.h:1277:61: warning: unused parameter ‘devinfo’ [-Wunused-parameter]
 brw_stage_has_packed_dispatch(const struct gen_device_info *devinfo,
                                                             ^~~~~~~
../../SOURCE/master/src/intel/compiler/brw_disasm.c: In function ‘src_ia1’:
../../SOURCE/master/src/intel/compiler/brw_disasm.c:849:18: warning: unused parameter ‘_reg_file’ [-Wunused-parameter]
         unsigned _reg_file,
                  ^~~~~~~~~

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>