* cgraphbuild.c (cgraph_rebuild_references): New.
	(cgraph_mark_reachable_node): Accept references to optimized out
	extern inlines.
	* cgraph.h (cgraph_rebuild_references): Declare.
	* tree-inline.c (tree_function_versioning): Use it.
	* ipa-struct-reorg.c (do_reorg_for_func): Likewise.

From-SVN: r159259