message: Enable `insert_after_excs` by default
  Summary: As title.
diff: @@ -24,7 +24,7 @@ class InsertSourceBlocksPass : public Pass {
  private:
  bool m_force_serialize_{false};
  bool m_force_run{false};
  - bool m_insert_after_excs{false};
  + bool m_insert_after_excs{true};
  friend class SourceBlocksTest;
  };
  