Unaligned bit arrays on the JavaScript target #7961

Job	Run time
lint-build	52s
test-wasm	1m 26s
rustfmt	10s
test (stable, x86_64-unknown-linux-gnu)	4m 3s
test (stable, x86_64-unknown-linux-musl)	6m 26s
validate	21s
test (stable, aarch64-unknown-linux-gnu)	2m 6s
test (stable, aarch64-unknown-linux-musl)	3m 3s
test (stable, x86_64-apple-darwin)	15m 24s
test (stable, x86_64-pc-windows-msvc)	5m 43s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	4m 36s
test-projects	1m 46s
	45m 56s

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