Add memory barrier to `Mutex#unlock` on aarch64 #10646

Job	Run time
check_format	1m 49s
x86_64-gnu-test (1.7.3)	36m 12s
x86_64-gnu-test-preview_mt	5m 57s
x86_64-gnu-test (1.8.2)	33m 50s
x86_64-gnu-test (1.9.2)	33m 3s
x86_64-musl-test	37m 35s
x86_64-gnu-test (1.10.1)	32m 58s
x86_64-gnu-test (1.11.2)	31m 39s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 9s
deploy_api_docs	0s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 6s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	32m 42s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	35m 5s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 8s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	34m 29s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	35m 44s
	7h 34m 26s

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