check_stack_overrun().


sql/slave.cc:
  Move initialization of THD::thread_stack before THD::store_globals()
sql/sql_acl.cc:
  Initialize THD::thread_stack in artificial THDs used
  to load gratns subsystem.
sql/sql_class.cc:
  Add an assert that THD::thread_stack is assigned.
sql/sql_insert.cc:
  Add initialization of THD::thread_stack (delayed insert
  thread).
sql/sql_parse.cc:
  Move initialization of THD::thread_stack before
  THD::store_globals().
sql/sql_udf.cc:
  Add initialization for THD::thread_stack (an artificial
  THD used to initialize UDF subsystem).
sql/tztime.cc:
  Add initialization for THD::thread_stack (an artificial
  THD used to initialize timezones).