Use wrapping cast for #[smi] arguments #3541

Job	Run time
compute-jobs	6s
build-linux / linux test	3m 50s
build-linux / linux lint-deps	1m 49s
build-linux / linux coverage	4m 10s
build-linux / linux lint	1m 0s
build-linux / linux test-miri	6m 55s
build-linux / linux test-ops	6m 0s
build-linux / linux test-publish	1m 37s
build-linux-arm / linux-arm test	6m 27s
build-linux-arm / linux-arm test-miri	11m 4s
build-linux-arm / linux-arm lint	1m 30s
build-linux-xl / linux-xl test-valgrind	22m 27s
build-macos / macos lint	53s
build-macos / macos test	3m 57s
build-windows / windows lint	3m 49s
build-windows / windows test	9m 8s
success	1s
	1h 24m 43s

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