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Remove TmpLayout in layout_of_enum 09a3846 from <https://github.com/rust-lang/rust/pull/103693> made LayoutData be owned instead of interned in `Variants::Multiple::variants`[^1], so there's no need for `TmpLayout` in layout_of_enum anymore, and we can just store the variants' layouts directly in the prospective `LayoutData`s' `variants` fields. This should have no effect on semantics or layout. (written as part of rust-lang/rust#145337 but not related to the layout optimizations in that PR) [^1]: see line 1154 of `compiler/rustc_target/src/abi/mod.rs` in the linked commit; `Variants::Multiple::variants` effectively changed from `IndexVec<.., Layout<'tcx>>` to `IndexVec<.., LayoutData>` where the `LayoutData`s are not interned as `Layout`s (`LayoutData` was at the time called `LayoutS`)