PR tree-optimization/49039
	* tree-vrp.c (extract_range_from_binary_expr): For
	MIN_EXPR <~[a, b], ~[c, d]> and MAX_EXPR <~[a, b], ~[c, d]>
	return ~[MAX_EXPR <a, c>, MIN_EXPR <b, d>].

	* gcc.c-torture/execute/pr49039.c: New test.
	* gcc.dg/tree-ssa/pr49039.c: New test.
	* g++.dg/torture/pr49039.C: New test.

From-SVN: r173876