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Improve DispatchFromDyn and CoerceUnsized impl validation #135228

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Improve DispatchFromDyn and CoerceUnsized impl validation #135228

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  • Disallow arbitrary 1-ZST fields in DispatchFromDyn -- only PhantomData, and 1-ZSTs that mention no params (which is needed to support, e.g., the Global alloctor in Box<T, U = Global>).
  • Don't allow coercing between non-ZSTs to ZSTs (since the previous check wasn't actually checking the field tys were the same before checking the layout...)
  • Normalize the field before checking it's PhantomData.

Fixes #135215
Fixes #135214
Fixes #135220

r? @BoxyUwU or reassign

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 8, 2025
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