[Bug debug/79289] DWARF info for typeof of C function with no args and no prototype is empty pointer

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79289

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Ian Lance Taylor from comment #1)
> This patch seems to fix the problem, but I can't tell whether this is
> correct or whether the other obvious change is correct.

This one looks good.