aarch64: fix BTI in bsaes assembly code #45

Job	Run time
basic_clang	5m 33s
basic_gcc	5m 14s
check_docs	57s
check_update	1m 12s
check-ansi	2m 30s
minimal	2m 26s
no-deprecated	4m 48s
address_ub_sanitizer	10m 6s
non-caching	15m 11s
no-shared-macos (macos-13)	5m 23s
no-shared-ubuntu	3m 52s
no-shared-macos (macos-14)	3m 2s
self-hosted	0s
enable_non-default_options	4m 11s
external-test-cf-quiche	3m 35s
external-test-pyca (1.51.0, 3.9)	6m 13s
external-tests	11m 25s
full_featured	6m 24s
fuzz_tests	3m 9s
legacy	4m 3s
memory_sanitizer	18m 24s
no-legacy	5m 14s
out-of-readonly-source-and-install-ubuntu	7m 3s
threads_sanitizer	5m 35s
out-of-readonly-source-and-install-macos (macos-13)	10m 11s
out-of-readonly-source-and-install-macos (macos-14)	5m 45s
	2h 31m 26s

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