c++: Stat-hack for members [PR 98530]

c++: Stat-hack for members [PR 98530]

This was a header file that deployed the stat-hack inside a class
(both a member-class and a [non-static data] member had the same
name).  Due to the way that's represented in name lookup we missed the
class.  Sadly just changing the representation globally has
detrimental effects elsewhere, and this is a rare case, so just
creating a new overload on the fly shouldn't be a problem.

	PR c++/98530
	gcc/cp/
	* name-lookup.c (lookup_class_binding): Rearrange a stat-hack.
	gcc/testsuite/
	* g++.dg/modules/stat-mem-1.h: New.
	* g++.dg/modules/stat-mem-1_a.H: New.
	* g++.dg/modules/stat-mem-1_b.C: New.