WebGPURenderer: Add error message for LineLoop 3D objects.

examples/jsm/renderers/webgpu/WebGPURenderer.js

@@ -617,6 +617,10 @@ class WebGPURenderer {
 
 				}
 
+			} else if ( object.isLineLoop ) {
+
+				console.error( 'THREE.WebGPURenderer: Objects of type THREE.LineLoop are not supported. Please use THREE.Line or THREE.LineSegments.' );
+
 			} else if ( object.isMesh || object.isLine || object.isPoints ) {
 
 				if ( object.isSkinnedMesh ) {