[incremental] Patch: FYI: fix lowering passes problem

[Tom Tromey]

>>>>> "Paolo" == Paolo Bonzini <bonzini@gnu.org> writes:

>> +/* We need an initial pass for all_lowering_passes that does nothing
>> +   but is a place where we can hang TODO_set_props.  */
>> +static struct tree_opt_pass pass_do_nothing_but_lower =
>> +{
>> +  "nothingbutlower",			/* name */

Paolo> You want NULL here.

Could you say why?
This is not documented afaict.

Tom