Harden cleanup wipe barrier #155

Job	Run time
no_std target build (aarch64-unknown-linux-gnu)	20s
no_std target build (thumbv7em-none-eabihf)	17s
no_std target build (x86_64-unknown-freebsd)	20s
no_std target build (wasm32-unknown-unknown)	16s
Miri	13m 20s
no_std target build (x86_64-unknown-linux-gnu)	24s
Format, lint, test, and audit	1m 9s
Platform tests (windows-latest)	43s
Platform tests (macos-latest)	35s
Platform tests (ubuntu-latest)	27s
	17m 51s

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