After-merge fix for merge of MySQL 5.1.41 into MariaDB: Valgrind fixes.

mysql-test/mysql-test-run.pl:
  Fix Valgrind warnings: add more post-shutdown warning suppressions, and revert
  bad previous change.
sql/log_event.cc:
  Manually apply fix for Bug#48340 (basically missing initialisation
  of thd->lex->local_file in Load_log_event::do_apply_event())

mysql-test/mysql-test-run.pl

@@ -223,7 +223,7 @@ my $opt_strace_client;
 our $opt_user = "root";
 
 my $opt_valgrind= 0;
-my $opt_valgrind_mysqld= 0;
+our $opt_valgrind_mysqld= 0;
 my $opt_valgrind_mysqltest= 0;
 my @default_valgrind_args= ("--show-reachable=yes");
 my @valgrind_args;
@@ -3990,6 +3990,8 @@ sub extract_warning_lines ($) {
      qr/unknown variable 'loose-/,
      qr/Now setting lower_case_table_names to [02]/,
      qr/deprecated/,
+     qr/Slave SQL thread retried transaction/,
+     qw/Slave \(additional info\)/,
     );
 
   my $match_count= 0;

sql/log_event.cc

@@ -4509,6 +4509,7 @@ int Load_log_event::do_apply_event(NET* net, Relay_log_info const *rli,
     as the present method does not call mysql_parse().
   */
   lex_start(thd);
+  thd->lex->local_file= local_fname;
   mysql_reset_thd_for_next_command(thd);
 
   if (!use_rli_only_for_errors)