VRP: x+1 and -x cannot be INT_MIN

VRP: x+1 and -x cannot be INT_MIN

2017-11-20  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* vr-values.c (extract_range_from_binary_expr): Use a full range
	for VR_VARYING.

gcc/testsuite/
	PR testsuite/82951
	* gcc.c-torture/execute/20040409-1.c: Move invalid tests...
	* gcc.c-torture/execute/20040409-1w.c: ... here with -fwrapv.
	* gcc.c-torture/execute/20040409-2.c: Move invalid tests...
	* gcc.c-torture/execute/20040409-2w.c: ... here with -fwrapv.
	* gcc.c-torture/execute/20040409-3.c: Move invalid tests...
	* gcc.c-torture/execute/20040409-3w.c: ... here with -fwrapv.
	* gcc.dg/tree-ssa/cmpmul-1.c: Tweak condition.
	* gcc.dg/tree-ssa/vrp118.c: New file.

From-SVN: r254954