Annotate a LeakSanitizer false positive in BitVector.
Annotate a LeakSanitizer false positive in BitVector.

When BitVector allocates memory, it shifts the pointer by 1 before storing it.
LeakSanitizer cannot recognize such pointers, so the memory is reported as
leaked. Annotate the allocation site to silence the leak reports.

BUG=242672
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/111103007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@163919 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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