prog_to_nir: OPCODE_EXP is not nir_op_fexp

It's a weird thing that provides some values related to 2**x.  It's also
already handled by a case in the switch.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jason Ekstrand <jason.ekstrand@intel.com>
1 file changed