backport: re PR tree-optimization/61452 (hang at -O1 and -Os on x86_64-linux-gnu)

backport: re PR tree-optimization/61452 (hang at -O1 and -Os on x86_64-linux-gnu)

2014-09-09  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2014-06-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/61452
	* tree-ssa-sccvn.c (visit_phi): Remove pointless setting of
	expr and has_constants in case we found a leader.
	(simplify_binary_expression): Always valueize operands first.
	(simplify_unary_expression): Likewise.

	* gcc.dg/torture/pr61452.c: New testcase.

From-SVN: r215081