fix exception-ptr accessors for libc++ again
Summary: Another approach to fixing the exception-ptr accessors for libc++. This time, just define mimics of `__cxa_exception` both ways, and test to find out which way to cast. Reviewed By: JunqiWang Differential Revision: D28561635 fbshipit-source-id: d27430d8fe2d73205bf1a8c31321be4c76808df8
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