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Fix memory64 passing of (rep i64) for borrows - #754
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This PR fills in a case we missed in #624 (which added 🐘-gated memory64 support) which is, when a
(borrow $R)handle is passed to the component that defined$R, the (i64)repvalue must be passed instead of thei32handle index. This involved plumbing theLiftLowerContextdown intoalignmentandelem_size(which were previously invariant, but now care about the direction and current-instance) and adding thelift/lowerdirection toLiftLowerContext. This allowed a bit of tidying up to make things less verbose.