Unaligned bit arrays on the JavaScript target #8411

Job	Run time
lint-build	58s
rustfmt	7s
test-wasm	1m 22s
test (stable, x86_64-unknown-linux-gnu)	3m 31s
validate	15s
test (stable, x86_64-unknown-linux-musl)	4m 12s
test (stable, aarch64-unknown-linux-gnu)	2m 5s
test (stable, aarch64-unknown-linux-musl)	2m 58s
test (stable, x86_64-apple-darwin)	13m 11s
test (stable, x86_64-pc-windows-msvc)	7m 21s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	3m 40s
test-projects	1m 48s
	41m 28s

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