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alloc: make RawVec round up allocation sizes to next power-of-two
The system allocator may give more memory than requested, usually rounding up to the next power-of-two. This PR uses a similar logic inside RawVec to be able to make use of this excess memory. NB: this is *not* used for `with_capacity` and `shrink_to_fit` pending discussion in rust-lang#29931
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