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auto merge of #17110 : thestinger/rust/dst, r=cmr
The pointer in the slice must not be null, because enum representations make that assumption. The `exchange_malloc` function returns a non-null sentinel for the zero size case, and it must not be passed to the `exchange_free` lang item. Since the length is always equal to the true capacity, a branch on the length is enough for most types. Slices of zero size types are statically special cased to never attempt deallocation. This is the same implementation as `Vec<T>`. Closes #14395
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