Remove INFORMATION_SCHEMA.INNODB_TRX.trx_adaptive_hash_latched

In MariaDB 10.2, this column is practically always reported as 0,
even before the data field trx_t::has_search_latch was removed.

mysql-test/suite/innodb/r/innodb_information_schema.result

@@ -42,7 +42,6 @@ trx_isolation_level	varchar(16)	NO
 trx_unique_checks	int(1)	NO		0	
 trx_foreign_key_checks	int(1)	NO		0	
 trx_last_foreign_key_error	varchar(256)	YES		NULL	
-trx_adaptive_hash_latched	int(1)	NO		0	
 trx_is_read_only	int(1)	NO		0	
 trx_autocommit_non_locking	int(1)	NO		0	
 trx_state	trx_weight	trx_tables_in_use	trx_tables_locked	trx_rows_locked	trx_rows_modified	trx_concurrency_tickets	trx_isolation_level	trx_unique_checks	trx_foreign_key_checks

mysql-test/suite/innodb/r/innodb_skip_innodb_is_tables.result

 select * from information_schema.innodb_trx;
-trx_id	trx_state	trx_started	trx_requested_lock_id	trx_wait_started	trx_weight	trx_mysql_thread_id	trx_query	trx_operation_state	trx_tables_in_use	trx_tables_locked	trx_lock_structs	trx_lock_memory_bytes	trx_rows_locked	trx_rows_modified	trx_concurrency_tickets	trx_isolation_level	trx_unique_checks	trx_foreign_key_checks	trx_last_foreign_key_error	trx_adaptive_hash_latched	trx_is_read_only	trx_autocommit_non_locking
+trx_id	trx_state	trx_started	trx_requested_lock_id	trx_wait_started	trx_weight	trx_mysql_thread_id	trx_query	trx_operation_state	trx_tables_in_use	trx_tables_locked	trx_lock_structs	trx_lock_memory_bytes	trx_rows_locked	trx_rows_modified	trx_concurrency_tickets	trx_isolation_level	trx_unique_checks	trx_foreign_key_checks	trx_last_foreign_key_error	trx_is_read_only	trx_autocommit_non_locking
 Warnings:
 Warning	1012	InnoDB: SELECTing from INFORMATION_SCHEMA.innodb_trx but the InnoDB storage engine is not installed
 select * from information_schema.innodb_locks;

storage/innobase/handler/i_s.cc

@@ -530,18 +530,7 @@ static ST_FIELD_INFO	innodb_trx_fields_info[] =
 	 STRUCT_FLD(old_name,		""),
 	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
 
-#ifdef BTR_CUR_HASH_ADAPT
-#define IDX_TRX_ADAPTIVE_HASH_LATCHED	20
-	{STRUCT_FLD(field_name,		"trx_adaptive_hash_latched"),
-	 STRUCT_FLD(field_length,	1),
-	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
-	 STRUCT_FLD(value,		0),
-	 STRUCT_FLD(field_flags,	0),
-	 STRUCT_FLD(old_name,		""),
-	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
-#endif /* BTR_CUR_HASH_ADAPT */
-
-#define IDX_TRX_READ_ONLY		20 + I_S_AHI
+#define IDX_TRX_READ_ONLY		20
 	{STRUCT_FLD(field_name,		"trx_is_read_only"),
 	 STRUCT_FLD(field_length,	1),
 	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
@@ -550,7 +539,7 @@ static ST_FIELD_INFO	innodb_trx_fields_info[] =
 	 STRUCT_FLD(old_name,		""),
 	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
 
-#define IDX_TRX_AUTOCOMMIT_NON_LOCKING	21 + I_S_AHI
+#define IDX_TRX_AUTOCOMMIT_NON_LOCKING	21
 	{STRUCT_FLD(field_name,		"trx_autocommit_non_locking"),
 	 STRUCT_FLD(field_length,	1),
 	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
@@ -697,11 +686,6 @@ fill_innodb_trx_from_cache(
 		OK(field_store_string(fields[IDX_TRX_LAST_FOREIGN_KEY_ERROR],
 				      row->trx_foreign_key_error));
 
-#ifdef BTR_CUR_HASH_ADAPT
-		/* trx_adaptive_hash_latched */
-		OK(fields[IDX_TRX_ADAPTIVE_HASH_LATCHED]->store(0, true));
-#endif /* BTR_CUR_HASH_ADAPT */
-
 		/* trx_is_read_only*/
 		OK(fields[IDX_TRX_READ_ONLY]->store(
 			   row->trx_is_read_only, true));