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

[Dan Albert]

Hi jroelofs,

Since the personality functions do the actual unwinding on ARM, and will
also stop unwinding when they encounter a handler, we invoke
_Unwind_VRS_Interpret() directly form _Unwind_Backtrace().
    
To simplify, the logic for decoding an EHT is moved out of
unwindOneFrame() and into its own function, decode_eht_entry(). Unlike
unwindOneFrame(), which could only handle ARM's compact personality
function entries (section 6.3) decode_eht_entry() can handle the generic
entries (section 6.2).

http://reviews.llvm.org/D5112

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