[Bug middle-end/68785] [6 Regression] valgrind reports issues with folding on x86_64

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68785

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase:
int
foo (void)
{
  return *(int *) "";
}