re PR tree-optimization/78482 (wrong code at -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu)

	PR tree-optimization/78482
	* gcc.dg/torture/pr78482.c (c, d): Use signed char instead of char.
	(bar): New function.
	(main): Call bar instead of printf.

From-SVN: r242794