re PR tree-optimization/55110 (Internal compiler error in vectorizable_reduction, at tree-vect-loop.c:4633)

	PR tree-optimization/55110
	* tree-vect-loop.c (vectorizable_reduction): Don't assert
	that STMT_VINFO_RELATED_STMT of orig_stmt is stmt.

	* gcc.dg/pr55110.c: New test.

From-SVN: r193845