[Bug sanitizer/94881] [10 Regression] incorrect Wstringop-overflow warning with thread sanitizer since r10-5451-gef29b12cfbb4979a

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94881

--- Comment #2 from Arnd Bergmann <arnd at linaro dot org> ---
I ran into another file that triggered this problem, reducing that one gave me
a slightly simpler test case:

struct a {
  char b[8];
};
struct e {
  unsigned c;
  struct a d[2];
};
void i(struct e *e, void *g) {
  struct e *f = e + 1;
  __builtin_memcpy(f->d[f->c].b, g, 1);
}