Update ChangeLog

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+2022-02-20  Ivan Maidanski <ivmai@mail.ru>
+
+	* src/atomic_ops_stack.h [AO_USE_ALMOST_LOCK_FREE
+	&& !AO_STACK_ATTR_ALLIGNED] (AO_STACK_ATTR_ALLIGNED): Define.
+	* src/atomic_ops_stack.h [AO_USE_ALMOST_LOCK_FREE]
+	(AO_stack_t.AO_ptr): Add AO_STACK_ATTR_ALLIGNED attribute.
+
+2022-02-20  Ivan Maidanski <ivmai@mail.ru>
+
+	* src/atomic_ops_stack.c [AO_USE_ALMOST_LOCK_FREE]
+	(AO_stack_push_explicit_aux_release): Use acquire barrier to read list
+	value (stored to next local variable); read list value and store it to
+	x element before iterating over AO_stack_bl (and, thus, retry iterating
+	over AO_stack_bl if CAS failed).
+
 2022-02-15  Ivan Maidanski <ivmai@mail.ru>
 
 	* tests/test_stack.c (main): Adjust indentation for ifdef VERBOSE