c++: Cleanup some decl pushing apis

In cleaning up local decl handling, here's an initial patch that takes
advantage of C++'s default args for the is_friend parm of pushdecl,
duplicate_decls and push_template_decl_real and the scope & tpl_header
parms of xref_tag.  Then many of the calls simply not mention these.
I also rename push_template_decl_real to push_template_decl, deleting
the original forwarding function.  This'll make my later patches
changing their types less intrusive.  There are 2 functional changes:

1) push_template_decl requires is_friend to be correct, it doesn't go
checking for a friend function (an assert is added).

2) debug_overload prints out Hidden and Using markers for the overload set.

	gcc/cp/
	* cp-tree.h (duplicate_decls): Default is_friend to false.
	(xref_tag): Default tag_scope & tpl_header_p to ts_current & false.
	(push_template_decl_real): Default is_friend to false.  Rename to
	...
	(push_template_decl): ... here.  Delete original decl.
	* name-lookup.h (pushdecl_namespace_level): Default is_friend to
	false.
	(pushtag): Default tag_scope to ts_current.
	* coroutines.cc (morph_fn_to_coro): Drop default args to xref_tag.
	* decl.c (start_decl): Drop default args to duplicate_decls.
	(start_enum): Drop default arg to pushtag & xref_tag.
	(start_preparsed_function): Pass DECL_FRIEND_P to
	push_template_decl.
	(grokmethod): Likewise.
	* friend.c (do_friend): Rename push_template_decl_real calls.
	* lambda.c (begin_lamnbda_type): Drop default args to xref_tag.
	(vla_capture_type): Likewise.
	* name-lookup.c (maybe_process_template_type_declaration): Rename
	push_template_decl_real call.
	(pushdecl_top_level_and_finish): Drop default arg to
	pushdecl_namespace_level.
	* pt.c (push_template_decl_real): Assert no surprising friend
	functions.  Rename to ...
	(push_template_decl): ... here.  Delete original function.
	(lookup_template_class_1): Drop default args from pushtag.
	(instantiate_class_template_1): Likewise.
	* ptree.c (debug_overload): Print hidden and using markers.
	* rtti.c (init_rtti_processing): Drop refault args from xref_tag.
	(build_dynamic_cast_1, tinfo_base_init): Likewise.
	* semantics.c (begin_class_definition): Drop default args to
	pushtag.
	gcc/objcp/
	* objcp-decl.c (objcp_start_struct): Drop default args to
	xref_tag.
	(objcp_xref_tag): Likewise.
	libcc1/
	* libcp1plugin.cc (supplement_binding): Drop default args to
	duplicate_decls.
	(safe_pushtag): Drop scope parm.  Drop default args to pushtag.
	(safe_pushdecl_maybe_friend): Rename to ...
	(safe_pushdecl): ... here. Drop is_friend parm.  Drop default args
	to pushdecl.
	(plugin_build_decl): Adjust safe_pushdecl & safe_pushtag calls.
	(plugin_build_constant): Adjust safe_pushdecl call.

1 files changed, 3 insertions, 8 deletions

diff --git a/gcc/cp/rtti.c b/gcc/cp/rtti.c
index 0ab3c42..7c4bff7 100644
--- a/gcc/cp/rtti.c
+++ b/gcc/cp/rtti.c
@@ -169,8 +169,7 @@ init_rtti_processing (void)
   tree type_info_type;
 
   push_nested_namespace (std_node);
-  type_info_type = xref_tag (class_type, get_identifier ("type_info"),
-			     /*tag_scope=*/ts_current, false);
+  type_info_type = xref_tag (class_type, get_identifier ("type_info"));
   pop_nested_namespace (std_node);
   const_type_info_type_node
     = cp_build_qualified_type (type_info_type, TYPE_QUAL_CONST);
@@ -761,9 +760,7 @@ build_dynamic_cast_1 (location_t loc, tree type, tree expr,
 
 	      push_abi_namespace ();
 	      tinfo_ptr = xref_tag (class_type,
-				    get_identifier ("__class_type_info"),
-				    /*tag_scope=*/ts_current, false);
-
+				    get_identifier ("__class_type_info"));
 	      tinfo_ptr = build_pointer_type
 		(cp_build_qualified_type
 		 (tinfo_ptr, TYPE_QUAL_CONST));
@@ -948,10 +945,8 @@ tinfo_base_init (tinfo_s *ti, tree target)
   vtable_ptr = ti->vtable;
   if (!vtable_ptr)
     {
-      tree real_type;
       push_abi_namespace ();
-      real_type = xref_tag (class_type, ti->name,
-			    /*tag_scope=*/ts_current, false);
+      tree real_type = xref_tag (class_type, ti->name);
       pop_abi_namespace ();
 
       if (!COMPLETE_TYPE_P (real_type))