Py/JS/RB: Use instanceof in more places

python/ql/src/analysis/AlertSuppression.ql

@@ -80,9 +80,7 @@ class NoqaSuppressionComment extends LineSuppressionComment {
 /**
  * The scope of an alert suppression comment.
  */
-class SuppressionScope extends @py_comment {
-  SuppressionScope() { this instanceof SuppressionComment }
-
+class SuppressionScope extends @py_comment instanceof SuppressionComment {
   /**
    * Holds if this element is at the specified location.
    * The location spans column `startcolumn` of line `startline` to
@@ -93,7 +91,7 @@ class SuppressionScope extends @py_comment {
   predicate hasLocationInfo(
     string filepath, int startline, int startcolumn, int endline, int endcolumn
   ) {
-    this.(SuppressionComment).covers(filepath, startline, startcolumn, endline, endcolumn)
+    super.covers(filepath, startline, startcolumn, endline, endcolumn)
   }
 
   /** Gets a textual representation of this element. */