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由 Nicholas Nethercote 提交于
`thir::Pat::kind` is a `Box<PatKind>`, which doesn't follow the usual pattern in AST/HIR/THIR which is that the "kind" enum for a node is stored inline within the parent struct. This commit makes the `PatKind` directly inline within the `Pat`. This requires using `Box<Pat>` in all the types that hold a `Pat. Ideally, `Pat` would be stored in `Thir` like `Expr` and `Stmt` and referred to with a `PatId` rather than `Box<Pat>`. But this is hard to do because lots of `Pat`s get created after the destruction of the `Cx` that does normal THIR building. But this does get us a step closer to `PatId`, because all the `Box<Pat>` occurrences would be replaced with `PatId` if `PatId` ever happened. At 128 bytes, `Pat` is large. Subsequent commits will shrink it.
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