Merge of bug#51851.

Also moved HA_DATA_PARTITION from ha_partition.cc to table.h.

mysql-test/t/partition_binlog_stmt.test

@@ -0,0 +1,28 @@
+--source include/have_partition.inc
+--source include/have_binlog_format_statement.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+--echo #
+--echo # Bug#51851: Server with SBR locks mutex twice on LOAD DATA into
+--echo #            partitioned MyISAM table
+perl;
+open( INIT, ">init_file.txt");
+print INIT "abcd\n";
+close( INIT );
+EOF
+
+CREATE TABLE t1
+(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+ name TINYBLOB NOT NULL,
+ modified TIMESTAMP DEFAULT '0000-00-00 00:00:00',
+ INDEX namelocs (name(255))) ENGINE = MyISAM
+PARTITION BY HASH(id) PARTITIONS 2;
+
+LOAD DATA LOCAL INFILE 'init_file.txt'
+INTO TABLE t1 (name);
+
+--remove_file init_file.txt
+DROP TABLE t1;