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`ty::Placeholder` is used by the trait solver and computing its layout was necessary, because the `PointerLike` trait used to be automatically implemented for all types with pointer-like layout. Nowadays, `PointerLike` requires user-written impls and the trait solver no longer computes any layouts, so this can be removed. Unevaluated constants that aren't generic should have caused a const eval error earlier during normalization.