Dataflow: Add totalorder predicates to all languages.

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowDispatch.qll

@@ -344,6 +344,16 @@ abstract class DataFlowCallable extends TDataFlowCallable {
 
   /** Gets the location of this dataflow callable. */
   abstract Location getLocation();
+
+  /** Gets a best-effort total ordering. */
+  int totalorder() {
+    this =
+      rank[result](DataFlowCallable c, string file, int startline, int startcolumn |
+        c.getLocation().hasLocationInfo(file, startline, startcolumn, _, _)
+      |
+        c order by file, startline, startcolumn
+      )
+  }
 }
 
 /** A callable function. */
@@ -1419,6 +1429,16 @@ abstract class DataFlowCall extends TDataFlowCall {
   ) {
     this.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
   }
+
+  /** Gets a best-effort total ordering. */
+  int totalorder() {
+    this =
+      rank[result](DataFlowCall c, int startline, int startcolumn |
+        c.hasLocationInfo(_, startline, startcolumn, _, _)
+      |
+        c order by startline, startcolumn
+      )
+  }
 }
 
 /** A call found in the program source (as opposed to a synthesised call). */