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	dfs_skip_bases as appropriate.
	(modify_all_vtables): Walk in pre-order.
	* search.c (dfs_walk_all, dfs_walk_once_r,
	dfs_walk_once_accessible_r): Assert post order function never
	returns dfs_skip_bases.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@88939 138bc75d-0d04-0410-961f-82ee72b054a4