2014-06-04  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2013-05-13  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/57230
	* tree-ssa-strlen.c (handle_char_store): Add missing integer_zerop
	check.

	* gcc.dg/strlenopt-23.c: New test.


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