common.opt (flto-odr-type-merging): Ignore.

	* common.opt (flto-odr-type-merging): Ignore.
	* invoke.texi (-flto-odr-type-merging): Remove.
	* ipa-devirt.c (odr_vtable_hasher:odr_name_hasher): Remove.
	(can_be_vtable_hashed_p): Remove.
	(hash_odr_vtable): Remove.
	(odr_vtable_hasher::hash): Remove.
	(types_same_for_odr): Remove.
	(types_odr_comparable): Remove.
	(odr_vtable_hasher::equal): Remove.
	(odr_vtable_hash_type, odr_vtable_hash): Remove.	
	(add_type_duplicate): Do not synchronize vtable and name hashtables.
	(get_odr_type): Do not use vtable hash.
	(dump_odr_type): Remove commented out code.
	(build_type_inheritance_graph): Do not allocate vtable hash.
	(rebuild_type_inheritance_graph): Do not delete vtable hash.
	* ipa-utils.h (type_with_linkage_p): Drop vtable hash path.
	(odr_type_p): Likewise.
	* tree.c (need_assembler_name_p): Remove flag_lto_odr_type_mering
	test.

From-SVN: r272037