WIP: Alternate data layout Salsa20 for (ye)scrypt #770

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	22s
build (stable, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	13s
test (1.85.0)	20s
test (stable)	24s
build (1.85.0, thumbv7em-none-eabi)	24s
minimal-versions	-1s
	2m 4s

Provide feedback