Fix #2264: OpEntryPoint incorrectly including function parameters.

Test/spv.1.4.OpEntryPoint.opaqueParams.vert

@@ -0,0 +1,15 @@
+#version 450
+
+layout(binding = 0) uniform sampler2D s2D;
+layout(binding = 1) uniform texture2D t2D;
+layout(binding = 3) uniform sampler s;
+
+vec2 funOpaque(in sampler2D s2D, texture2D t2D, sampler s)
+{
+    return textureSize(s2D, 0) * texture(sampler2D(t2D, s), vec2(0.5)).xy;
+}
+
+void main()
+{
+    vec2 size = funOpaque(s2D, t2D, s);
+}