Do not generate formal arglist from actual if we have already resolved it.

Do not generate formal arglist from actual if we have already resolved it.

This bug was another case of generating a formal arglist from
an actual one where we should not have done so.  The fix is
straightforward:  If we have resolved the formal arglist, we should
not generare a new one.

OK for trunk and backport?

gcc/fortran/ChangeLog:

	PR fortran/120163
	* gfortran.h: Add formal_resolved to gfc_symbol.
	* resolve.cc (gfc_resolve_formal_arglist): Set it.
	(resolve_function): Do not call gfc_get_formal_from_actual_arglist
	if we already resolved a formal arglist.
	(resolve_call): Likewise.

gcc/testsuite/ChangeLog:

	PR fortran/120163
	* gfortran.dg/interface_61.f90: New test.