Fix failing test cases for MDEV-7912 patch

mysql-test/r/uniques_crash-7912.result

+call mtr.add_suppression("Out of memory");
 set sql_mode="";
 drop table if exists t1,t2;
-Warnings:
-Note	1051	Unknown table 't1'
-Note	1051	Unknown table 't2'
 create table `t1` (`a` datetime not null) engine=InnoDB;
 create table `t2` (`a` int not null) engine=innodb;
 replace into t1 values (),();
-Warnings:
-Warning	1364	Field 'a' doesn't have a default value
 insert into t2 values(0);
 set session sort_buffer_size = 1024*1024*1024*1024;
-SET session debug_dbug= '+d,make_merge_buff_alloc_fail';
 delete d2 from t2 as d1, t1 as d2 where d1.a <=> d2.a;
-ERROR HY000: Out of memory (Needed 2 bytes)
-SET SESSION debug_dbug=DEFAULT;
 drop table t2;
 drop table t1;

mysql-test/t/uniques_crash-7912.test

+#
 # MDEV-7912
+#
 # multitable delete with wrongly set sort_buffer_size crashes in merge_buffers
+
 --source include/have_innodb.inc
+--source include/have_debug.inc
+--source include/windows.inc
+
+call mtr.add_suppression("Out of memory");
+
 set sql_mode="";
+--disable_warnings
 drop table if exists t1,t2;
 create table `t1` (`a` datetime not null) engine=InnoDB;
 create table `t2` (`a` int not null) engine=innodb;
-
 replace into t1 values (),();
 insert into t2 values(0);
 set session sort_buffer_size = 1024*1024*1024*1024;
-SET session debug_dbug= '+d,make_merge_buff_alloc_fail';
---error 5 #EE_OUTOFMEMORY
+#Either fail with EE_OUTOFMEMORY, or succeed
+--error 0 , 5
 delete d2 from t2 as d1, t1 as d2 where d1.a <=> d2.a;
-SET SESSION debug_dbug=DEFAULT;
+--enable_warnings
 
 drop table t2;
 drop table t1;

sql/uniques.cc

@@ -608,8 +608,6 @@ bool Unique::walk(TABLE *table, tree_walk_action action, void *walk_action_arg)
   if (flush_io_cache(&file) || reinit_io_cache(&file, READ_CACHE, 0L, 0, 0))
     return 1;
   size_t buff_sz= (max_in_memory_size / full_size + 1) * full_size;
-  DBUG_EXECUTE_IF("make_merge_buff_alloc_fail",
-                  DBUG_SET("+d,simulate_out_of_memory"););
   if (!(merge_buffer = (uchar *)my_malloc(buff_sz, MYF(MY_WME))))
     return 1;
   if (buff_sz < (ulong) (full_size * (file_ptrs.elements + 1)))
@@ -739,8 +737,6 @@ bool Unique::get(TABLE *table)
   /* Not enough memory; Save the result to file && free memory used by tree */
   if (flush())
     return 1;
-  DBUG_EXECUTE_IF("make_merge_buff_alloc_fail",
-                  DBUG_SET("+d,simulate_out_of_memory"););
   size_t buff_sz= (max_in_memory_size / full_size + 1) * full_size;
   if (!(sort_buffer= (uchar*) my_malloc(buff_sz, MYF(MY_WME))))
     return 1;