update .gitignore in selftests/vm

Signed-off-by: Yuan Sun <sunyuan3@huawei.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index ff1bb16..a937a9d 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -2,3 +2,8 @@
 hugepage-shm
 map_hugetlb
 thuge-gen
+compaction_test
+mlock2-tests
+on-fault-limit
+transhuge-stress
+userfaultfd