[PATCH] libcxx: Switch to use __gnu_unwind_frame() for libunwind.

[Logan Chien]

In http://reviews.llvm.org/D9962#177558, @rengolin wrote:

> And I imagine that this will also fix the problem we had earlier with undefined __gnu_unwind_frame, right?


I haven't encountered this problem by myself.  But I believe this should fix your problem.


http://reviews.llvm.org/D9962

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