2008-07-07  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36713
	* tree-flow-inline.h (is_call_used): New function.
	* tree-nrv.c (dest_safe_for_nrv_p): Use it.
	* tree-tailcall.c (suitable_for_tail_opt_p): Likewise.
	* tree-outof-ssa.c (create_temp): Set call-used flag if required.

From-SVN: r137571