[pointer][transmute] Support generic TransmuteFrom #1969
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This commit replaces the
TransparentWrapper
trait with a more generic,bidirectional
TransmuteFrom<T>
trait.U: TransmuteFrom<T>
indicatesthat
T
andU
have the same sizes and thatT
can be transmuted intoU
given certain alignment and validity invariant mappings.Makes progress on #1122
This PR is on branch ptr-overhaul-more-generic-issue-1945.