It would be helpful to poison unused capacity in AK::Vector upon growing and/or shrinking the capacity, or when moving from inline capacity to out of line capacity.
libstdc++ does this for std::vector, here:
With internal macros _GLIBCXX_ASAN_ANNOTATE_GROW, _GLIBCXX_ASAN_ANNOTATE_GREW, _GLIBCXX_ASAN_ANNOTATE_SHRINK and _GLIBCXX_ASAN_ANNOTATE_REINIT.
libstdc++ instruments every insert, emplace, erase, and resize event.
The actual instrumentation is here, it seems they have a helper struct to manage ASAN annotations.
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