Friend class name lookup 1/n, PR c++/18471

	Friend class name lookup 1/n, PR c++/18471
	* decl.c (lookup_and_check_tag): New function.
	(xref_tag, start_enum): Use it.
	(check_elaborated_type_specifier): Move TEMPLATE_TYPE_PARM check
	before !DECL_IMPLICIT_TYPEDEF_P.  Also display previously declared
	location.
	* name-lookup.c (lookup_name_current_level): Rename to ...
	(lookup_name_innermost_nonclass_level): ... this.
	(lookup_type_scope): New function.
	* name-lookup.h (lookup_name_current_level): Rename to ...
	(lookup_name_innermost_nonclass_level): ... this.
	(lookup_type_scope): Add declaration.

	* g++.dg/lookup/struct1.C: Adjust expected error.
	* g++.dg/parse/elab1.C: Likewise.
	* g++.dg/parse/elab2.C: Likewise.
	* g++.dg/parse/int-as-enum1.C: Likewise.
	* g++.dg/parse/struct-as-enum1.C: Likewise.
	* g++.dg/parse/typedef1.C: Likewise.
	* g++.dg/parse/typedef3.C: Likewise.
	* g++.dg/parse/typedef4.C: Likewise.
	* g++.dg/parse/typedef5.C: Likewise.
	* g++.dg/template/nontype4.C: Likewise.
	* g++.old-deja/g++.benjamin/typedef01.C: Likewise.
	* g++.old-deja/g++.other/elab1.C: Likewise.
	* g++.old-deja/g++.other/syntax4.C: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90657 138bc75d-0d04-0410-961f-82ee72b054a4