[Bug c/71479] error on __builtin_add_overflow with bool or enum pointer as last argument

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71479

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #1)
> Dup of PR66938?

You're right, bug 66938 points out the same problem.  I leave it to you to
decide which one to close as a dupe (this one is broader in mentioning
enumerated types as well and has a test case so I'd be inclined to keep it
open.)