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compiler: `{TyAnd,}Layout` comes home
The `Layout` and `TyAndLayout` types are heavily abstract and have no particular target-specific qualities, though we do use them to answer questions particular to targets. We can keep it that way if we simply move them out of `rustc_target` and into `rustc_abi`. They bring a small entourage of connected types with them, but that's fine.
This will allow us to strengthen a few abstraction barriers over time and thus make the notoriously gnarly layout code easier to refactor. For now, we don't need to worry about that and deliberately use reexports to minimize this particular diff.
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For more information about how rustc works, see the rustc dev guide.