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The conversion from an uninitialized void* to a T* triggers CFI, but this
is as-designed (the caller of VectorBuffer, in this case circular_deque,
is responsible for calling placement new and delete on this buffer).

Change-Id: I375800df238f2a077720e7d73c35a2e9140f91de
Reviewed-on: https://chromium-review.googlesource.com/627017Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496508}