[Bug c/79152] -Wimplicit-fallthrough false positive triggered by goto statements

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79152

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Simplified testcase:
int
foo (int x, char *y)
{
  switch (x)
    {
    case 1:
      goto lab1;
      goto lab2;
      x = y[0];
lab2:
lab1:
      x += y[1];
    }
  return x;
}