Don't copy maps and sets when computing their memory usage. #4491
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Also use the `Impl` base class to type-erase the small size of `SmallVector`.
jonmeow
approved these changes
Nov 5, 2024
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Also use the
Implbase class to type-erase the small size ofSmallVector. (I'd like to do the same forMapandSetby usingMapViewandSetView, but that runs into ambiguities due toBumpPtrAllocator's unconstrained converting constructor.)