[Bug middle-end/121000] __builtin_dynamic_object_size should work for FAM with VLA element when annotated with counted_by

[qinzhao at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121000

--- Comment #13 from qinzhao at gcc dot gnu.org ---
fixed in gcc16.
should be backported to GCC15 as well.