Fix crash in exception_wrapper::get_exception<>
Summary: [Folly] Fix crash in `exception_wrapper::get_exception<>`. When the contained object is unthrown and does not inherit `std::exception`, `get_exception` templated over a type that does not inherit `std::exception` must throw and catch internally and may then return a pointer to the internally thrown object, which has since been deallocated. Attempting to dereference that pointer is undefined behavior is correctly caught by ASAN as heap-use-after-free. Fix it by storing objects not inheriting `std::exception` using only the `std::exception_ptr` representation. As a downside, we no longer get the small-object optimization or the non-throwing optimization for objects which do not inherit `std::exception`. But this is not likely to be terribly concerning in practice. Reviewed By: ericniebler Differential Revision: D6504911 fbshipit-source-id: 0065de911733b5cab87be55e7e4e47f0a9c09140
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