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

[muecker at gwdg dot de via Gcc-bugs]

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

--- Comment #43 from Martin Uecker <muecker at gwdg dot de> ---
Yes, this is great! I am also looking forward to your patch!  It seems it works
with the bounds checking code?  Does it also interact with the object size
pass?