aarch64: remove unnecessary mask #205

Job	Run time
feature checks	35s
docs	18s
Clippy	23s
fmt	15s
Fuzz	38s
Miri (x86_64-unknown-linux-gnu, --no-default-features)	56s
Miri (x86_64-unknown-linux-gnu)	1m 21s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 23s
Outdated	0s
Test (x86_64-unknown-linux-gnu, nightly)	31s
Test (x86_64-unknown-linux-gnu, beta)	23s
Test (x86_64-unknown-linux-gnu, stable)	23s
Test (x86_64-unknown-linux-gnu, 1.64)	49s
Test (aarch64-unknown-linux-gnu, nightly)	54s
Test (aarch64-unknown-linux-gnu, beta)	47s
Test (aarch64-unknown-linux-gnu, stable)	1m 36s
Test (aarch64-unknown-linux-gnu, 1.64)	1m 6s
	12m 18s

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