2011-12-19  Richard Guenther  <rguenther@suse.de>

	PR lto/51573
	* streamer-hooks.h (struct streamer_hooks): Add second
	ref_p parameter to write_tree.
	(stream_write_tree): Adjust.
	(stream_write_tree_shallow_non_ref): New define.
	* lto-streamer.h (lto_output_tree): Adjust.
	* lto-streamer-out.c (lto_output_tree): Likewise.
	* tree-streamer-out.c (streamer_write_chain): Only
	force the immediate tree to be streamed as non-reference.

	* gcc.dg/lto/20111207-2_0.c: Adjust.
	* g++.dg/lto/pr51573-1_0.C: New testcase.

From-SVN: r182487