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f627b55cf5
1. The size was being adjusted for the alignment which does not make any sense without the context of the base pointer. Now we just add the `alignment - 1` to the size if needed then adjust the pointer. 2. The root pointer of the last allocation is now stored in order to make the free operation more useful (and to cover the right memory region for ASan). 3. Resizing now only works on the last allocation instead of any address in a valid range, which resulted in overwriting allocations that had just been made. 4. `old_memory` is now re-poisoned entirely before the resized range is returned with the new range unpoisoned. This will guarantee that there are no unpoisoned gaps. Fixes #2694