AArch64 CI

Fix protect `Array#map` against concurrent mutation #12595

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Run time

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Job	Run time
aarch64-gnu-build	1m 40s
aarch64-musl-build	1m 49s
aarch64-gnu-test-stdlib	4m 53s
aarch64-gnu-test-compiler	27m 21s
aarch64-musl-test-compiler	29m 34s
aarch64-musl-test-stdlib	5m 9s
	1h 10m 26s