Added a 32 bit rdiff for myisam_mrr instead of a 64 bit rdiff

mysql-test/main/myisam_mrr,32bit.rdiff

+--- main/myisam_mrr.result	2019-05-14 15:44:52.232663568 +0530
++++ main/myisam_mrr.reject	2019-05-14 15:51:37.123563538 +0530
+@@ -617,8 +617,8 @@
+ show status like 'handler_mrr%';
+ Variable_name	Value
+ Handler_mrr_init	1
+-Handler_mrr_key_refills	1
+-Handler_mrr_rowid_refills	1
++Handler_mrr_key_refills	0
++Handler_mrr_rowid_refills	0
+ set join_buffer_size=10;
+ explain select sum(t1.b) from t0,t1 where t0.a=t1.a;
+ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/main/myisam_mrr,64bit.rdiff

---- main/myisam_mrr.result	2019-04-27 21:46:07.000000000 +0530
-+++ main/myisam_mrr,64bit.reject	2019-05-11 20:40:32.000000000 +0530
-@@ -188,7 +188,7 @@
- select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
-                                                       or c='no-such-row2');
- id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
--1	SIMPLE	t4	range	idx1	idx1	29	NULL	10	Using index condition; Using where; Rowid-ordered scan
-+1	SIMPLE	t4	range	idx1	idx1	29	NULL	10	Using index condition; Rowid-ordered scan
- select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
-                                                     or c='no-such-row2');
- a	b	c	filler
-@@ -210,7 +210,7 @@
- explain 
- select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
- id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
--1	SIMPLE	t4	range	idx1	idx1	29	NULL	20	Using index condition; Using where; Rowid-ordered scan
-+1	SIMPLE	t4	range	idx1	idx1	29	NULL	20	Using index condition; Rowid-ordered scan
- select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
- a	b	c	filler
- b-1	NULL	c-1	NULL-15
-@@ -617,8 +617,8 @@
- show status like 'handler_mrr%';
- Variable_name	Value
- Handler_mrr_init	1
--Handler_mrr_key_refills	0
--Handler_mrr_rowid_refills	0
-+Handler_mrr_key_refills	1
-+Handler_mrr_rowid_refills	1
- set join_buffer_size=10;
- explain select sum(t1.b) from t0,t1 where t0.a=t1.a;
- id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/main/myisam_mrr.result

@@ -617,8 +617,8 @@ sum(t1.b)
 show status like 'handler_mrr%';
 Variable_name	Value
 Handler_mrr_init	1
-Handler_mrr_key_refills	0
-Handler_mrr_rowid_refills	0
+Handler_mrr_key_refills	1
+Handler_mrr_rowid_refills	1
 set join_buffer_size=10;
 explain select sum(t1.b) from t0,t1 where t0.a=t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra