Created by Laurynas Biveinis on 2015-02-04 and last modified on 2015-02-04
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735. By Laurynas Biveinis on 2015-02-04

Fix SET STATEMENT ... FOR <statement> crashes:
1) if <statement> needs to commit implicitly and fails (bug 1418049);
2) if <statement> is RW in a RO transaction (bug 1387951);
3) if <statement> is needs to reopen a temp table and fails (bug 1412423).

All three bugs are related and caused by mysql_execute_command jumping
over to an error exit (one goto per each bug) and thus skipping
per_query_variables_backup variable initialization. But the cleanup of
restoring thd->variables from the uninitialzied variable still
happened. Fixed trivially.

This bug was also indicated by a compilation warning:

07:37:58 /home/jenkins/workspace/percona-server-5.6-debian-binary-32/label_exp/debian6-32/percona-server-5.6-5.6.22-71.0/sql/sql_parse.cc: In function 'int mysql_execute_command(THD*)':
error: 'per_query_variables_backup' may be used uninitialized in this

fixing which is part of bug 1408232.

Added testcases.

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