[Bug tree-optimization/95448] Missing optimization: pointer untag, re-tag should be no-op

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95448

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Simplified testcase:
int f(int a)
{
  if ((a&7) != 1) __builtin_unreachable();
  a &= ~7;
  a |= 1;
  return a;
}