[Bug c/61861] Incorrect column number for -Wdiscarded-qualifiers

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61861

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems that the location of __FILE__ is generally broken, e.g. on
extern void foo (int i);
void
f (void)
{
  foo (__FILE__);
}
the column info is wrong as well.