* c-decl.c (last_function_parm_vars, current_function_parm_vars):
	New static variables.
	(struct c_scope): Add parms and warned_forward_parm_decls
	fields; remove parm_order.
	(storedecls, storetags): Delete.
	(poplevel): Also clear bindings on the parms chain.
	(pushdecl): Handle forward declarations of parameters, and
	chain PARM_DECLs on the parms list, not the names list.
	(lookup_name_current_level): Check for PARM_DECLs on the parms
	list too.
	(push_parm_decl): Don't update parm_order.
	(clear_parm_order): Rename mark_forward_parm_decls.  Issue the
	warning, only once per parameter list, and set TREE_ASM_WRITTEN
	on the decls here.  Then move the forward decls to the names list.
	(grokparms): Set last_function_parm_vars.
	(get_parm_info): Don't use gettags or getdecls.  No need to
	extract non-parms from the parms list, or reorganize the parms
	list.  Feed nonparms back in the TREE_TYPE of the list node
	returned.  Issue only one error per parameter list for "void"
	appearing more than once in said parameter list.  Collapse
	parmlist_tags_warning into this function to avoid double scan
	of tags list.
	(start_function): Set current_function_parm_vars.
	(store_parm_decls_newstyle): Bypass pushdecl, manipulate scope
	directly.  Get non-parms from current_function_parm_vars; no
	need to extract them from the parms chain.  Properly bind tags
	in the new scope.
	(store_parm_decls_oldstyle): No need to extract non-parameters
	from the parms chain, nor to store them back afterward.  Move
	declaration to top of function, restructure code reordering
	DECL_ARGUMENTS.
	(store_parm_decls): No need to save and restore warn_shadow.
	* c-parse.in: Don't call parmlist_tags_warning nor
	clear_parm_order.  Call mark_forward_parm_decls when forward
	parm decls are encountered.
	* c-tree.h: Prototype mark_forward_parm_decls; not
	clear_parm_order or parmlist_tags_warning.

testsuite:
	* gcc.dg/struct-in-proto-1.c: New test.

From-SVN: r69945