2016-03-09  Richard Biener  <rguenther@suse.de>

	c-family/
	PR c/70143
	* c-common.c (strict_aliasing_warning): Add back
	alias_sets_conflict_p check.

	* gcc.dg/Wstrict-aliasing-bogus-upcast.c: New testcase.
	* gcc.dg/Wstrict-aliasing-struct-with-char-member.c: Likewise.
	* gcc.dg/Wstrict-aliasing-struct-member.c: Remove again.

From-SVN: r234084