Add memory barrier to `Mutex#unlock` on aarch64 #2222

Job	Run time
Build interpreter	9m 48s
Test Interpreter	4m 26s
Test std_spec with interpreter (0)	3m 31s
Test std_spec with interpreter (1)	1m 54s
Test std_spec with interpreter (2)	2m 20s
Test std_spec with interpreter (3)	2m 47s
	24m 46s

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