emaste added a comment. Note that the addition of the referenceCount at the beginning of `__cxa_exception` for 64-bit builds causes the `_Unwind_Exception unwindHeader` to become misaligned. libstdc++ had this same issue (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38732, now fixed) and libcxxrt does as well (https://github.com/pathscale/libcxxrt/issues/38).
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