bors 51c0db6a91 Auto merge of #106790 - the8472:rawvec-niche, r=scottmcm
add more niches to rawvec

Previously RawVec only had a single niche in its `NonNull` pointer. With this change it now has `isize::MAX` niches since half the value-space of the capacity field is never needed, we can't have a capacity larger than isize::MAX.
2023-12-20 02:19:10 +00:00
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