[Bug bootstrap/78817] stage2 bootstrap failure in vec.h:1613:5: error: argument 1 null where non-null expected after r243661

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78817

--- Comment #12 from Martin Sebor <msebor at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #3)
> It is a warning (as well as a bootstrap comparison error) on powerpc64-linux.
> You tested on powerpc64le-linux, different animal.

I missed that.  But I'm not able to reproduce the bootstrap comparison error
even on powerpc64-linux (on POWER8).  With the warning fixed my bootstrap just
completed.