rustc_target: Begin unifying Arch enum #142775
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There are a few different instances of this Arch enum in
rustc_target. I would like to unify them so that we use shared code in more cases, as part of an incremental step towards turning Target into a proper builder with type-level correctness instead of its current constructor. However, it's definitely true the immediate changes look somewhat jank and have the disadvantage of in some cases handling some code less exhaustively, so I'm going to ask some maintainers if it's okay.r? @madsmtm