[Bug bootstrap/88721] [9 regression] -Wmaybe-uninitialized warnings in sparc.c

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88721

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> This patch allowed the bootstrap to finish.

There are 3 callers of function_arg_slotno so we would potentially need to add
6 initializations already.  So I'd rather initialize pregno and ppadding at the
beginning of the function if this works:

  enum mode_class mclass = GET_MODE_CLASS (mode);

  /* Silence warnings in the callers.  */
  *pregno = -1;
  *ppadding = -1;

  if (type && TREE_ADDRESSABLE (type))
    return -1;