glsl: Delete the ir_binop_bfm and ir_triop_bfi opcodes.

glsl: Delete the ir_binop_bfm and ir_triop_bfi opcodes.

TGSI doesn't use these - it just translates ir_quadop_bitfield_insert
directly.  NIR can handle ir_quadop_bitfield_insert as well.

These opcodes were only used for i965, and with Jason's recent patches,
we can do this lowering in NIR (which also gains us SPIR-V handling).
So there's not much point to retaining this GLSL IR lowering code.

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