Bug #31355547: RUN CLANG-TIDY MODERNIZE-USE-OVERRIDE OVER THE CODE BASE

Post-push fix: Fix some Clang warnings in InnoDB.

Change-Id: I89d9d63ea0ef61dbdbecd6aa5c7290677cc6adee

Author: Steinar H. Gunderson

storage/innobase/include/sync0types.h

@@ -1066,7 +1066,7 @@ struct btrsea_sync_check : public sync_check_functor_t {
       : m_result(), m_has_search_latch(has_search_latch) {}
 
   /** Destructor */
-  virtual ~btrsea_sync_check() {}
+  ~btrsea_sync_check() override {}
 
   /** Called for every latch owned by the calling thread.
   @param[in]	level		Level of the existing latch
@@ -1129,7 +1129,7 @@ struct dict_sync_check : public sync_check_functor_t {
       : m_result(), m_dict_mutex_allowed(dict_mutex_allowed) {}
 
   /** Destructor */
-  virtual ~dict_sync_check() {}
+  ~dict_sync_check() override {}
 
   /** Check the latching constraints
   @param[in]	level		The level held by the thread */

storage/innobase/row/row0pread.cc

@@ -472,7 +472,8 @@ Parallel_reader::Scan_ctx::create_persistent_cursor(
 }
 
 bool Parallel_reader::Ctx::move_to_next_node(PCursor *pcursor, mtr_t *mtr) {
-  page_cur_t *cur = m_range.first->m_pcur->get_page_cur();
+  page_cur_t *cur MY_ATTRIBUTE((unused)) =
+      m_range.first->m_pcur->get_page_cur();
 
   if (m_scan_ctx->m_config.m_read_ahead) {
     page_no_t next_page_no = btr_page_get_next(page_cur_get_page(cur), mtr);