MDEV-35049 fixup: Fix SUX_LOCK_GENERIC

xtrabackup_backup_func(): Invoke btr_search_sys_create(), because
innodb_shutdown() assumes that it will have been called.

srv_boot(): Invoke btr_search_sys_create(). This fixes assertion failures
in the test innodb.temporary_table.

btr_sea::create(): Do not invoke enable().

buf_pool_t::create(): Instead of invoking btr_sea::create(),
invoke btr_sea::enable() when needed.

extra/mariabackup/xtrabackup.cc

@@ -5510,6 +5510,7 @@ fail:
 	srv_thread_pool_init();
 	/* Reset the system variables in the recovery module. */
 	trx_pool_init();
+	btr_search_sys_create();
 	recv_sys.create();
 
 	xb_filters_init();

storage/innobase/btr/btr0sea.cc

@@ -118,8 +118,6 @@ void btr_sea::create() noexcept
 {
   for (partition &part : parts)
     part.init();
-  if (enabled)
-    enable();
 }
 
 void btr_sea::alloc(ulint hash_size) noexcept

storage/innobase/buf/buf0buf.cc

@@ -1506,7 +1506,10 @@ bool buf_pool_t::create() noexcept
   last_activity_count= srv_get_activity_count();
 
   buf_LRU_old_ratio_update(100 * 3 / 8, false);
-  btr_search_sys_create();
+#ifdef BTR_CUR_HASH_ADAPT
+  if (btr_search.enabled)
+    btr_search.enable();
+#endif
 
 #ifdef __linux__
   if (srv_operation == SRV_OPERATION_NORMAL)

storage/innobase/srv/srv0srv.cc

@@ -604,6 +604,7 @@ void srv_boot()
   buf_dblwr.init();
   srv_thread_pool_init();
   trx_pool_init();
+  btr_search_sys_create();
   srv_init();
 }