* tree-vrp.c (simplify_min_or_max_using_ranges): New.
	(simplify_stmt_using_ranges): Simplify MIN and MAX exprs.

	testsuite/
	* gcc.dg/vrp-min-max-1.c: New.
	* gcc.dg/vrp-min-max-2.c: New.

From-SVN: r226809