tests: Add many more tests for ternary expressions.

Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Henri Verbeet (@hverbeet)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/463

tests/hlsl/sm6-ternary.shader_test

@@ -0,0 +1,46 @@
+% The ternary operator works differently in sm6.
+% It now shortcuts, and is no longer per-component.
+
+[require]
+shader model >= 6.0
+
+[pixel shader]
+uniform float4 x;
+
+float4 main() : sv_target
+{
+    return x.x ? x : x - 1;
+}
+
+[test]
+uniform 0 float4 2.0 3.0 4.0 5.0
+todo draw quad
+probe all rgba (2.0, 3.0, 4.0, 5.0)
+uniform 0 float4 0.0 10.0 11.0 12.0
+todo draw quad
+probe all rgba (-1.0, 9.0, 10.0, 11.0)
+
+
+[pixel shader]
+float4 f;
+
+float4 main() : sv_target
+{
+    float f1 = 0.1, f2 = 0.2, f3;
+    f3 = f.x ? (f1 = 0.5) + 0.2 : (f2 = 0.6);
+    return float4(f1, f2, f3, 0.0);
+}
+
+[test]
+uniform 0 float4 1.0 0.0 0.0 0.0
+draw quad
+probe all rgba (0.5, 0.2, 0.7, 0.0)
+
+
+[pixel shader fail]
+float4 x, y, z;
+
+float4 main() : sv_target
+{
+    return x ? y : z;
+}