18ca8bf8ee
Things like `padding_needed_for` are current implemented being super careful to handle things like `Layout::size` potentially being `usize::MAX`. But now that 95295 has happened, that's no longer a concern. It's possible to add two `Layout::size`s together without risking overflow now. So take advantage of that to remove a bunch of checked math that's not actually needed. For example, the round-up-and-add-next-size in `extend` doesn't need any overflow checks at all, just the final check for compatibility with the alignment. (And while I was doing that I made it all unstably const, because there's nothing in `Layout` that's fundamentally runtime-only.) |
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