Merge pull request #13281 from devreal/fix-s390x-opal-atomic-int128t-align

Force alignment of opal_atomic_int128_t to be 16B

Author: bosilca

opal/include/opal_stdatomic.h

@@ -72,7 +72,7 @@ typedef _Atomic opal_int128_t opal_atomic_int128_t;
 
 #        else
 
-typedef volatile opal_int128_t opal_atomic_int128_t;
+typedef volatile opal_int128_t opal_atomic_int128_t __opal_attribute_aligned__(16);
 
 #        endif