[PATCH] [libcxxabi] Make _Unwind_Backtrace() work on ARM.

[Antoine Labour]

================
Comment at: src/Unwind/Unwind-EHABI.cpp:223
@@ +222,3 @@
+    *len = (((data[1] >> 24) & 0xff) + 1) * 4;
+    data++; // Skip the first word, which is the prel31 offset.
+  } else {
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Mmh, this makes assumptions about the personality routine doesn't it?
The generic model is supposed to be compatible with a variety of languages and I'm not sure we can assume the generic data is the same as what the C++ personality routine expects, can we?

http://reviews.llvm.org/D5112