Never change BINFO_INHERITANCE_CHAIN.
* init.c (emit_base_init): Change modification of
BINFO_INHERITANCE_CHAIN to an assert.
* search.c (get_base_distance_recursive): Likewise.
(get_base_distance): Likewise.
(lookup_member): Likewise.
(convert_pointer_to_single_level): Likewise.
(lookup_field): Likewise. Lose setting TREE_VIA_* on TREE_LISTs.
(lookup_fnfields): Likewise.
* tree.c (propagate_binfo_offsets): Don't call unshare_base_binfos.
(unshare_base_binfos): Don't call propagate_binfo_offsets.
(layout_basetypes): Call propagate_binfo_offsets instead of
unshare_base_binfos.
* decl.c (xref_basetypes): Call unshare_base_binfos.
* pt.c (instantiate_class_template): Likewise.
* tree.c (reverse_path): Remove 'copy' parm; always make a
temporary copy.
* class.c (build_vbase_path): Just call it.
* search.c (compute_access): Likewise. Don't re-reverse.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@22024
138bc75d-0d04-0410-961f-
82ee72b054a4