mysql-test/r/sp.result:
  New test case for BUG#6600.
mysql-test/t/sp.test:
  New test case for BUG#6600.
sql/sp_head.cc:
  Added yet another multiple result set statement to the list.
sql/sql_parse.cc:
  Have to invalidate SP caches in CHECK TABLE, or it will produce very
  strange results when called in SPs.