PR fortran/90329
	* lang.opt (fbroken-callers): Remove.
	(ftail-call-workaround, ftail-call-workaround=): New options.
	* gfortran.h (struct gfc_namespace): Add implicit_interface_calls.
	* interface.c (gfc_procedure_use): Set implicit_interface_calls
	for calls to implicit interface procedures.
	* trans-decl.c (create_function_arglist): Use flag_tail_call_workaround
	instead of flag_broken_callers.  If it is not 2, also require
	sym->ns->implicit_interface_calls.
	* invoke.texi (fbroken-callers): Remove documentation.
	(ftail-call-workaround, ftail-call-workaround=): Document.

From-SVN: r271738