Function overload check cleanup. Added if statement to parsing.

test/codegen/custom_hint.golden

@@ -0,0 +1,17 @@
+cbuffer __PROPERTIES : register(b0) 
+{
+    float __PROPERTIES__time;
+}
+
+
+float4 vs_main(float3 pos : POSITION) : SV_POSITION
+{
+    return float4(pos.x, pos.y, pos.z, 1.0f);
+}
+
+float4 ps_main(float4 pos : SV_POSITION) : SV_TARGET
+{
+    float t = __PROPERTIES__time;
+    return float4(1, 1, 1, 1);
+}
+