[PATCH] Use __atomic_exchange_n with GCC instead of Clang's __sync_swap

[Reid Kleckner]

Closed by commit rL219012 (authored by @rnk).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5604

Files:
  libcxxabi/trunk/src/cxa_default_handlers.cpp
  libcxxabi/trunk/src/cxa_handlers.cpp
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