[Bug c/108896] provide "element_count" attribute to give more context to __builtin_dynamic_object_size() and -fsanitize=bounds

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Iff only (GNU) C would accept the following ...

struct foo {
    ...
    unsigned int count;
    ...
    int data[count];
};