Unaligned bit arrays on the JavaScript target #8406

Job	Run time
test-wasm	1m 20s
rustfmt	5s
test (stable, x86_64-unknown-linux-gnu)	5m 16s
lint-build	49s
test (stable, x86_64-unknown-linux-musl)	4m 3s
validate	12s
test (stable, aarch64-unknown-linux-gnu)	2m 15s
test (stable, aarch64-unknown-linux-musl)	2m 43s
test (stable, x86_64-apple-darwin)	6m 56s
test (stable, x86_64-pc-windows-msvc)	5m 16s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	4m 4s
test-projects	1m 44s
	34m 43s

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