Let KeepAlive::copy() allow dummy executors to expire
Summary: [Folly] Let `KeepAlive::copy()` allow dummy executors to expire, and not attempt to dereference them to perform an acquire - which, as is known in advance, would fail and return false were the executor still to be alive. Reviewed By: andrewcox Differential Revision: D15683240 fbshipit-source-id: e2026493af6936b8f0f1b8fe3c1cb97d2bf0f96e
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