bzr push into mysql-trunk branch (anitha.gopi:3119 to 3120)

[Anitha Gopi]

 3120 Anitha Gopi	2011-05-27 [merge]
      Null merge from mysql-5.5

 3119 Tor Didriksen	2011-05-25
      Bug#11765562 58545 EXPORT_SET() CAN BE USED TO MAKE ENTIRE SERVER COMPLETELY UNRESPONSIVE
      
      The function EXPORT_SET(bits,on,off[,separator[,number_of_bits]])
      will concatenate (up to) 64*2 -1 strings: on/off and separator.
      The total length should not be greater than thd->variables.max_allowed_packet.
     @ mysql-test/r/func_str.result
        New test case.
     @ mysql-test/t/func_str.test
        New test case.
     @ sql/item_strfunc.cc
        In Item_func_export_set::val_str, verify that the size of the end result is within reasonable bounds.
     @ unittest/gunit/item-t.cc
        New test cases.
     @ unittest/gunit/test_utils.h
        Add accessor for handle_called.

    modified:
      mysql-test/r/func_str.result
      mysql-test/t/func_str.test
      sql/item_strfunc.cc
      unittest/gunit/item-t.cc
      unittest/gunit/test_utils.h

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