exception_wrapper thrown variant via abi/runtime
Summary: Reimplement `folly::exception_wrapper` thrown variant not to need to cache any pointers and rather to access the exception object and runtime type, and to perform runtime upcasting, via the platform runtime. This both simplifies and extends the capability of the thrown variant. Reviewed By: JunqiWang Differential Revision: D28625444 fbshipit-source-id: 12409bc75794f5135cdb73563b07fafdf5cc44cd
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