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

[Dan Albert]

Add test and fix ordering of unwinding in _Unwind_Backtrace() (was
unwinding after calling callback, causing _Unwind_Backtrace() to be
included in backtrace).

http://reviews.llvm.org/D5112

Files:
  include/unwind.h
  src/Unwind/Unwind-EHABI.cpp
  src/Unwind/UnwindLevel1-gcc-ext.c
  test/backtrace_test.cpp
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