`fn AlignedVec::resize`: Validate safety requirements, specifically o… #1253

Job	Run time
test on armv7-unknown-linux-gnueabihf	8m 50s
test on aarch64-unknown-linux-gnu	8m 3s
test on x86_64-unknown-linux-gnu	10m 13s
test on riscv64gc-unknown-linux-gnu	10m 1s
	37m 7s

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