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Nicholas Ormrod authored
Summary: Removing COW from fbstring had adverse memory consequences when sync'd with libgcc. Revert this diff to keep folly and libgcc in sync. Reviewed By: yfeldblum, luciang Differential Revision: D4019604 fbshipit-source-id: 80bd31c220098bfab37f0effc90f67876432369d
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