[Bug tree-optimization/108398] tree-object-size trips up with pointer arithmetic if an intermediate result is an invalid pointer

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108398

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
-fsanitize=undefined with no diagnostics doesn't mean code is UB free.
This testcase is still invalid.
Before the first g--;, g == &e, so g-- will set g to g - sizeof (int).  That is
UB.