prevent panic when compiling aarch64 vectorcall functions #1818

Job	Run time
minimal	18s
msrv	1m 38s
check-cfg	23s
docs	24s
quickchecking	23s
rustfmt-clippy	31s
test-book	6s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	1m 41s
test-expectations (ubuntu-latest)	1m 2s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	1m 49s
test-expectations (macos-latest)	2m 18s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	1m 44s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	1m 46s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	2m 13s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	2m 16s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	2m 13s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	2m 14s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 42s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 3s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 59s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 8s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 35s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 33s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 28s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 30s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 12s
test (macos-latest, 9.0, 0, 0, 0)	2m 16s
	45m 25s

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