Asserting correct database name lettercase in

various places in the code.

sql/sp.cc

@@ -1437,6 +1437,8 @@ bool lock_db_routines(THD *thd, char *db)
   uchar keybuf[MAX_KEY_LENGTH];
   DBUG_ENTER("lock_db_routines");
 
+  DBUG_ASSERT(ok_for_lower_case_names(db));
+
   /*
     mysql.proc will be re-opened during deletion, so we can ignore
     errors when opening the table here. The error handler is