[Bug middle-end/78629] vec.h: null pointer passed as argument 1, which is declared to never be null

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78629

--- Comment #3 from prathamesh3492 at gcc dot gnu.org ---
Fixed by r243125, forgot to add PR number to changelog in the patch :/