Unaligned bit arrays on the JavaScript target #7950

Job	Run time
lint-build	52s
rustfmt	13s
test-wasm	1m 14s
test (stable, x86_64-unknown-linux-gnu)	3m 48s
test (stable, x86_64-unknown-linux-musl)	5m 45s
validate	17s
test (stable, aarch64-unknown-linux-gnu)	2m 4s
test (stable, aarch64-unknown-linux-musl)	2m 29s
test (stable, x86_64-apple-darwin)	10m 37s
test (stable, x86_64-pc-windows-msvc)	4m 59s
test (stable, aarch64-apple-darwin, macos-latest, false, true)	4m 14s
test-projects	1m 33s
	38m 5s

Provide feedback