Unaligned bit arrays on the JavaScript target #8017

Job	Run time
test-wasm	1m 22s
lint-build	49s
test (stable, x86_64-unknown-linux-gnu)	3m 49s
rustfmt	13s
test (stable, x86_64-unknown-linux-musl)	5m 1s
test (stable, aarch64-unknown-linux-gnu)	2m 17s
validate	10s
test (stable, aarch64-unknown-linux-musl)	2m 38s
test (stable, x86_64-apple-darwin)	5m 6s
test (stable, x86_64-pc-windows-msvc)	4m 49s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	3m 40s
test-projects	1m 48s
	31m 42s

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