Shader cleanup

A couple of class members from PixelShader and VertexShader
were still public. Fixed that in this cleanup.

Change-Id: I2dfaac7fd4cecdc791f1ef7236148e74c4b5b486
Reviewed-on: https://swiftshader-review.googlesource.com/5850
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/src/Shader/PixelProgram.cpp b/src/Shader/PixelProgram.cpp
index 5c04196..1f50547 100644
--- a/src/Shader/PixelProgram.cpp
+++ b/src/Shader/PixelProgram.cpp
@@ -28,7 +28,7 @@
 	{
 		if(shader->getVersion() >= 0x0300)
 		{
-			if(shader->vPosDeclared)
+			if(shader->isVPosDeclared())
 			{
 				if(!halfIntegerCoordinates)
 				{
@@ -48,7 +48,7 @@
 				}
 			}
 
-			if(shader->vFaceDeclared)
+			if(shader->isVFaceDeclared())
 			{
 				Float4 area = *Pointer<Float>(primitive + OFFSET(Primitive, area));
 				Float4 face = booleanFaceRegister ? Float4(As<Float4>(CmpNLT(area, Float4(0.0f)))) : area;