shader: keep pixel helper lanes out of the EXEC and VCC words

src/graphics/shader/recompiler/ir/ShaderIR.h

@@ -547,6 +547,7 @@ struct ShaderInfo {
 	bool                            subgroup_shuffle              = false;
 	bool                            subgroup_arithmetic           = false;
 	bool                            subgroup_local_invocation_id  = false;
+	bool                            helper_invocation             = false;
 	bool                            compute_derivatives           = false;
 	bool                            image_gather_extended         = false;
 	bool                            function_lds                  = false;