Don't rely on pthread_atfork when possible
Summary: Because of https://github.com/google/sanitizers/issues/1116, any races detected during pthread_atfork deadlock the process. For forks issued from folly we can use an instrumented fork version to minimize the amount of code running via pthread_atfork. Reviewed By: yfeldblum Differential Revision: D23281093 fbshipit-source-id: fd4d3bf06b7992ff314f631ed899854a8b3f6c4b
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