dbl

zeroize: add unsafe `zeroize_flat_type` function (#1045) #1607

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 43s
build (1.65.0, wasm32-unknown-unknown)	2m 37s
test (1.65.0)	2m 37s
build (stable, thumbv7em-none-eabi)	10s
build (stable, wasm32-unknown-unknown)	27s
test (stable)	6s
minimal-versions / minimal-versions	15s
	8m 55s

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