[PATCH] libunwind: Fix unw_step() for ARM EHABI.

[Logan Chien]

Hi asl, rengolin, danalbert, compnerd,

This commit fixes the unw_step() for ARM EHABI.  However, this commit
also changes the implementation details for ARM EHABI.

The first change is that the personality function should call
__gnu_unwind_frame() for default (or de facto) frame unwinding based on
the ARM-defined unwind opcode.  The function __gnu_unwind_frame() will
in turn calls unw_step() which actually unwinds the frame.

The second change is that the implementation _Unwind_Backtrace() should
no longer calls unw_step() to unwind the frame; since according to ARM
EHABI, the personality function should unwind the frame for us.

Special thanks to Anton for helpful suggestion on the initial version of
this patch.

http://reviews.llvm.org/D9961

Files:
  src/Unwind-EHABI.cpp
  src/UnwindCursor.hpp
  src/UnwindLevel1-gcc-ext.c
  test/libunwind_01.pass.cpp
  test/libunwind_02.pass.cpp

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