vkd3d-shader/hlsl: Implement cross() intrinsic function.

Signed-off-by: Francisco Casas <fcasas@codeweavers.com>
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

tests/hlsl-cross.shader_test

@@ -0,0 +1,28 @@
+[pixel shader]
+float4 main(uniform float4 u, uniform float4 v) : sv_target
+{
+    float4 res = float4(0, 0, 0, 0);
+    res.xyz = cross(u, v);
+    return res;
+}
+
+[test]
+uniform 0 float4 1 -2 3 4
+uniform 4 float4 10 100 1000 10000
+draw quad
+probe all rgba (-2300, -970, 120, 0)
+
+
+
+[pixel shader]
+float4 main(uniform float4 u) : sv_target
+{
+    float4 res = float4(0, 0, 0, 3.5);
+    res.xyz = cross(u, 4);
+    return res;
+}
+
+[test]
+uniform 0 float4 1 -2 3 4
+draw quad
+probe all rgba (-20, 8, 12, 3.5)