HLSL: Smear scalars to match vectors for relational operations.

Yield a vector relational compare and a vector result.

Test/hlsl.shapeConv.frag

@@ -8,6 +8,15 @@ float4 PixelShaderFunction(float4 input, float f) : COLOR0
     u = float(1);
     u = float(2.0);
     u = float(f);
+    float2 w = 2.0;
+    float V = 1;
+    float3 MyVal = V;
+
+    float3 foo;
+    foo > 4.0;
+    foo >= 5.0;
+    6.0 < foo;
+    7.0 <= foo;
 
     return input;
 }