adding comment explaining why instanceof check was replaced

com.ibm.wala.core/src/com/ibm/wala/ipa/summaries/BypassMethodTargetSelector.java

@@ -126,6 +126,9 @@ public class BypassMethodTargetSelector implements MethodTargetSelector {
         return findOrCreateSyntheticMethod(site.getDeclaredTarget(), site.isStatic());
       }
 
+      // not using if (instanceof ClassHierarchyMethodTargetSelector) because
+      // we want to make sure that getCalleeTarget() is still called if 
+      // parent is a subclass of ClassHierarchyMethodTargetSelector
       if (parent.getClass() == ClassHierarchyMethodTargetSelector.class) {
         // already checked this case and decided not to bypass
         return chaTarget;