or-patterns: adjust lowering of `ast::Arm` & `ast::ExprKind::Let`.
Introduces a temporary hack to keep `Vec<P<Pat>>` in `hir::Arm.pats` so that we keep the changes more incremental.
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Introduces a temporary hack to keep `Vec<P<Pat>>` in `hir::Arm.pats` so that we keep the changes more incremental.