Fix race between setProxy() and setCallback()
Summary: D22371898 (https://github.com/facebook/folly/commit/4981497ad3333ab084e18b2a02a574cbf9438585) introduced a race by attempting to share the storage between `proxy_` and `callback_`: `setProxy()` and `setCallback()` may concurrently try to set both, and there's no good ordering we can use in `setCallback()` to fetch the proxy pointer before constructing the callback. So revert to the logic pre-D22371898 (https://github.com/facebook/folly/commit/4981497ad3333ab084e18b2a02a574cbf9438585). This means increasing the `Core` footprint by a further 8 bytes, but D22474230 should recover that. Differential Revision: D22474532 fbshipit-source-id: c63ca6ecd166fb71dcbeddbb2c04eb07494f99ea
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