MDEV-14425: Remove the unused function mtr_write_log()

This amends commit 37e7bde1

storage/innobase/include/mtr0mtr.h

@@ -104,12 +104,6 @@ savepoint. */
 @return true if the mtr is dirtying a clean page. */
 #define mtr_block_dirtied(b)	mtr_t::is_block_dirtied((b))
 
-/** Append records to the system-wide redo log buffer.
-@param[in]	log	redo log records */
-void
-mtr_write_log(
-	const mtr_buf_t*	log);
-
 /** Mini-transaction memo stack slot. */
 struct mtr_memo_slot_t {
 	/** pointer to the object */

storage/innobase/mtr/mtr0mtr.cc

@@ -351,25 +351,6 @@ struct mtr_write_log_t {
 	}
 };
 
-/** Append records to the system-wide redo log buffer.
-@param[in]	log	redo log records */
-void
-mtr_write_log(
-	const mtr_buf_t*	log)
-{
-	const ulint	len = log->size();
-	mtr_write_log_t	write_log;
-
-	ut_ad(!recv_no_log_write);
-	DBUG_PRINT("ib_log",
-		   (ULINTPF " extra bytes written at " LSN_PF,
-		    len, log_sys.lsn));
-
-	log_reserve_and_open(len);
-	log->for_each_block(write_log);
-	log_close();
-}
-
 /** Start a mini-transaction. */
 void mtr_t::start()
 {