small changes to dynamic allocations #17280
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Sized deallocation makes it pointless to provide an address that never overlaps with pointers returned by an allocator. Code can branch on the capacity of the allocation instead of a comparison with this sentinel. This improves the situation in #8859, and the remaining issues are only from the logging API, which should be disabled by default in optimized release builds anyway along with debug assertions. The remaining issues are part of #17081. Closes #8859
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