re PR middle-end/35691 (Missed (a == 0) && (b == 0) into (a|(typeof(a)(b)) == 0 when the types don't match)

2016-11-07  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR middle-end/35691
	* match.pd: Add following two patterns:
	(x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
	(x != 0 | y != 0) -> (x | typeof(x)(y)) != 0.

testsuite/
	* gcc.dg/pr35691-1.c: New test-case.
	* gcc.dg/pr35691-4.c: Likewise.

From-SVN: r241915