libmysqld/lib_sql.cc:
  Prepared_statement now resides entirely in sql_prepare.cc
  Embedded versions of setup_params_data moved to sql_prepare.cc
sql/mysql_priv.h:
  removed declarations for non-existing functions
sql/slave.cc:
  no thd->init_for_queries() any more
sql/sql_class.cc:
  added Statement and Statement_map classes.
  PREP_STMT replaced with Statement (Prepared_statement) and moved to
  sql_prepare.cc
sql/sql_class.h:
  added Statement and Statement_map classes.
  PREP_STMT replaced with Statement (Prepared_statement) and moved to
  sql_prepare.cc
sql/sql_parse.cc:
  thd->init_for_queries() doesn't exist any more
  comment moved to proper place
sql/sql_prepare.cc:
  PREP_STMT replaced with Prepared_statement
  minor code cleanups
tests/client_test.c:
  Later in the test we rely on order of rows, which normally is not defined.
  My patch changes the order.