Re-introduce getPresolveOrigRowsIndex

Author: fwesselm

highs/Highs.h

@@ -467,6 +467,14 @@ class Highs {
     return presolve_.data_.postSolveStack.getOrigColsIndex();
   }
 
+  /**
+   * @brief Return a const pointer to the original row indices for the
+   * presolved model
+   */
+  const HighsInt* getPresolveOrigRowsIndex() const {
+    return presolve_.data_.postSolveStack.getOrigRowsIndex();
+  }
+
   /**
    * @brief Return an LP associated with a MIP and its solution, with
    * each integer variable fixed to the value it takes in the MIP