tree-ssa-sccvn.c: Include tree-cfg.h and domwalk.h.

tree-ssa-sccvn.c: Include tree-cfg.h and domwalk.h.

2014-05-16  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c: Include tree-cfg.h and domwalk.h.
	(set_ssa_val_to): Handle unexpected sets to VN_TOP.
	(visit_phi): Ignore edges marked as not executable.
	(class cond_dom_walker): New.
	(cond_dom_walker::before_dom_children): Value-number
	control statements and mark successor edges as not
	executable if possible.
	(run_scc_vn): First walk all control statements in
	dominator order, marking edges as not executable.
	* tree-inline.c (copy_edges_for_bb): Be not confused
	about random edge flags.

	* gcc.dg/tree-ssa/ssa-fre-39.c: New testcase.
	* gcc.dg/tree-ssa/ssa-fre-40.c: Likewise.
	* gcc.dg/tree-ssa/ssa-pre-8.c: One more elimination.
	* gcc.dg/tree-ssa/struct-aliasing-2.c: Scan cddce1 dump.

From-SVN: r210492