Bug#59307 Valgrind: uninitialized value in rw_lock_set_writer_id_and_recursion_flag()

rw_lock_create_func(): Initialize lock->writer_thread, so that Valgrind
will not complain even when Valgrind instrumentation is not enabled.
Flag lock->writer_thread uninitialized, so that Valgrind can complain
when it is used uninitialized.

rw_lock_set_writer_id_and_recursion_flag(): Revert the bogus Valgrind
instrumentation that was pushed in the first attempt to fix this bug.

mysql-test/suite/innodb_plugin/r/innodb_bug59307.result

@@ -0,0 +1,28 @@
+CREATE TABLE t1 (
+t1_int INT,
+t1_time TIME
+) ENGINE=innodb;
+CREATE TABLE t2 (
+t2_int int PRIMARY KEY,
+t2_int2 INT
+) ENGINE=INNODB;
+INSERT INTO t2 VALUES ();
+Warnings:
+Warning	1364	Field 't2_int' doesn't have a default value
+INSERT INTO t1 VALUES ();
+SELECT *
+FROM t1 AS t1a
+WHERE NOT EXISTS
+(SELECT *
+FROM t1 AS t1b
+WHERE t1b.t1_int NOT IN
+(SELECT t2.t2_int
+FROM t2
+WHERE t1b.t1_time LIKE t1b.t1_int
+OR t1b.t1_time <> t2.t2_int2
+AND 6=7
+)
+)
+;
+t1_int	t1_time
+DROP TABLE t1,t2;