[PATCH] llvm-readobj: add support for ARM EHABI unwind info

[Saleem Abdulrasool]

Hi logan,

This adds some preliminary support for decoding ARM EHABI unwinding information.
The major functionality that remains from complete support is bytecode
translation.

Each Unwind Index Table is printed out as a separate entity along with its
section index, name, offset, and entries.

Each entry lists the function address, and if possible, the name, of the
function to which it corresponds.  The encoding model, personality routine or
index, and byte code is also listed.

http://llvm-reviews.chandlerc.com/D2513

Files:
  test/tools/llvm-readobj/arm-unwind.s
  tools/llvm-readobj/ARMEHABIPrinter.h
  tools/llvm-readobj/ELFDumper.cpp
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