Make sys_vars.delayed_insert_limit_func experimental due to Bug 50435.

Author: Alexander Nozdrin

mysql-test/collections/default.experimental

@@ -32,6 +32,7 @@ rpl.rpl_sync* @windows                    # Bug#50473 2010-01-20 alik rpl_sync f
 rpl.rpl_timezone*                        # Bug#47017 2009-10-27 alik rpl_timezone fails on PB-2 with mismatch error
 
 sys_vars.max_sp_recursion_depth_func @solaris # Bug#47791 2010-01-20 alik Several test cases fail on Solaris with error Thread stack overrun
+sys_vars.delayed_insert_limit_func       # Bug#50435 2010-01-25 alik sys_vars.delayed_insert_limit_func fails on Ubuntu x86_64 in debug mode
 
 # Declare all NDB-tests in ndb and rpl_ndb test suites experimental.
 # Usually the test cases from ndb and rpl_ndb test suites are not run in PB,