mysql-test/r/sp.result:
  New test cases for function ROW_COUNT().
mysql-test/t/sp.test:
  New test cases for function ROW_COUNT().
sql/item_func.cc:
  New Item_func_row_count.
sql/item_func.h:
  New Item_func_row_count.
sql/lex.h:
  New symbol for function ROW_COUNT().
sql/sql_class.h:
  New slot in THD for storing the row_count after insert, delete and update.
sql/sql_delete.cc:
  Set thd->row_count_func when deleting.
sql/sql_insert.cc:
  Set thd->row_count_func when inserting.
sql/sql_parse.cc:
  Stored procedure CALLs send the row count from the last insert, delete or update.
sql/sql_update.cc:
  Set thd->row_count_func when updating.
sql/sql_yacc.yy:
  New function ROW_COUNT().