stack zeroization #1882

Job	Run time
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	20s
test (1.85.0)	17s
build (1.85.0, thumbv7em-none-eabi)	14s
test (stable)	38s
minimal-versions / minimal-versions	25s
build (1.85.0, wasm32-unknown-unknown)	18s
	2m 25s

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