re PR c++/5682 (ICE in build_secondary_vtable)

re PR c++/5682 (ICE in build_secondary_vtable)

cp:
	PR c++/5682
	* cp-tree.h (BINFO_PRIMARY_P): Explain meaning better.
	(dfs_skip_nonprimary_vbases_unmarkedp): Remove.
	(dfs_skip_nonprimary_vbases_markedp): Remove.
	* search.c (get_shared_vbase_if_not_primary): Remove.
	(dfs_skip_nonprimary_vbases_unmarkedp): Remove.
	(dfs_skip_nonprimary_vbases_markedp): Remove.
	(dfs_unmarked_real_bases_queue_p): Just get the canonical binfo.
	(dfs_marked_real_bases_queue_p): Likewise.
testsuite:
	* g++.dg/abi/vbase9.C: New test.

From-SVN: r51392