libc: wrap padding fields with Padding newtype. #4609
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Description
Changes the types of fields with name
__pad,_pad,__padding,_padding,__rsvd,__unusedto use a new type wrapper aroundMaybeUninitas per #1453Only modifies private fields so that the changes can be backported.
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Checklist
libc-test/semverhave been updated*LASTor*MAXareincluded (see #3131)
cd libc-test && cargo test --target mytarget);especially relevant for platforms that may not be checked in CI