Fix exception_wrapper::throwException when called before main
Summary: [Folly] Fix `exception_wrapper::throwException` when called before `main`. When the `exception_wrapper` is empty, then `throwException` emits a message to `std::cerr` and terminates. If called before `main` begins or after `main` ends, then `std::cerr` might not have been constructed yet or might have already been destructed. Bad. Segfault, etc. So we need to ensure that `std::cerr` is alive by holding an instance of `std::ios_base::Init`. Reviewed By: Orvid Differential Revision: D4576190 fbshipit-source-id: dd84b5e82eb6bd817d405baf530714e0f4c314c5
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