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This separates the `SharedVtable` into 3: - `PromotableEvenVtable`: The original `SharedVtable`, which will promote the `Vec` to `Shared` on the first clone, and is selected when the `Vec`'s pointer has the LSB unset. - `PromotableOddVtable`: Similar to the `PromotableEvenVtable`, but selected when the `Vec`'s pointer has the LSB set. This vtable differs in the masking used when reconstructing the `Vec`. - `SharedVtable`: This no longer checks if its current kind is `VEC` or `ARC`, and is only created by the "promotable" vtables. This also adds a test using an "odd" global allocator that purposefully bumps all pointers with alignment of 1. Closes #343