`fn resize`: Make safe w/ `WithOffset<PicOrBuf<AlignedVec64<u8>>>` #1010

Job	Run time
test on armv7-unknown-linux-gnueabihf	8m 42s
test on aarch64-unknown-linux-gnu	8m 16s
test on x86_64-unknown-linux-gnu	10m 54s
test on riscv64gc-unknown-linux-gnu	9m 35s
	37m 27s

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