HLSL: Fix issue #442, smear and truncate shape conversions for == and !=.

Test/hlsl.shapeConv.frag

@@ -9,14 +9,22 @@ float4 PixelShaderFunction(float4 input, float f) : COLOR0
     u = float(2.0);
     u = float(f);
     float2 w = 2.0;
-    float V = 1;
+    float V = 1;
     float3 MyVal = V;
 
-    float3 foo;
-    foo > 4.0;
-    foo >= 5.0;
+    float3 foo;
+    foo > 4.0;
+    foo >= 5.0;
     6.0 < foo;
     7.0 <= foo;
 
+    v.x == v;
+    f != v;
+
+    float1 f1;
+
+    f1 == v;
+    v < f1;
+
     return input;
 }