[Bug c/67784] Incorrect parsing when using declarations in for loops and typedefs

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67784

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And another that seems to be caused by something else and isn't fixed by my
patch:
void
h ()
{
  for (typedef int T;;)
    if (1)
      ;
  T *x;
  x = 0;
}

I'm opening a separate PR for this one.