https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105868

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like the warning happens before the jump threading of:
  <bb 11> [local count: 80530636]:
  # buffer_57 = PHI <buffer_31(7), &_buffer(15)>
  if (&_buffer == buffer_57)
    goto <bb 12>; [98.77%]
  else
    goto <bb 13>; [1.23%]

  <bb 12> [local count: 79540110]:
  buffer_26 = __builtin_strdup (&_buffer);

  <bb 13> [local count: 746791736]:
  # _9 = PHI <0B(10), buffer_26(12), buffer_57(11), buffer_18(D)(14)>
  _buffer ={v} {CLOBBER(eol)};
  alloc_size ={v} {CLOBBER(eol)};
  return _9;

Happens.
In optimized, the threading happens and there is no reference to &_buffer in
the PHI for the retun.

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