Auto merge of #149218 - theemathas:pin-coerce-unsized, r=oli-obk Make PinCoerceUnsized require Deref Also, delete impls on non-Deref types. Pin doesn't do anything useful for non-Deref types, so PinCoerceUnsized on such types makes no sense. This is a breaking change, since stable code can observe the deleted `PinCoerceUnsized` impls by uselessly coercing between such types inside a `Pin`. There is still some strange behavior, such as `Pin<&mut i32>` being able to coerce to `Pin<&dyn Send>`, but not being able to coerce to `Pin<&i32>`. However, I don't think it's possible to fix this. Fixes https://github.com/rust-lang/rust/issues/145081
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