* call.c (build_over_call): Use DECL_CONTEXT, not
	DECL_VIRTUAL_CONTEXT.
	* class.c (modify_vtable_entry): Don't mess with
	DECL_VIRTUAL_CONTEXT.
	(set_vindex): Remove.
	(set_primary_base): Remove vfuns_p parameter.
	(determine_primary_base): Likewise.
	(modify_all_vtables): Likewise.
	(layout_class_type): Likewise.  Adjust calls to other functions
	accordingly.
	(finish_struct_1): Adjust calls to modified functions.  Set
	DECL_VINDEX here.
	* cp-tree.h (lang_type_class): Remove vsize.
	(CLASSTYPE_VSIZE): Remove.
	(lang_decl): Remove thunks.
	(DECL_THUNKS): Adjust.
	(DECL_VIRTUAL_CONTEXT): Remove.
	(duplicate_decls): Don't copy it.
	* pt.c (build_template_decl): Don't set it.
	(tsubst_decl): Likewise.
	* typeck.c (expand_ptrmemfunc_cst): Don't use it.

	* g++.dg/lookup/ptrmem1.C: New test.

From-SVN: r58548