[PATCH] tools: support decoding ARM EHABI opcodes in readobj

[Saleem Abdulrasool]

  Fix decoding issues pointed out by Logan, add support for spare/reserved disambiguation.  Add additional test cases.

Hi logan, t.p.northover,

http://llvm-reviews.chandlerc.com/D2565

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2565?vs=6499&id=6533#toc

Files:
  test/MC/ARM/eh-directive-unwind_raw.s
  test/tools/llvm-readobj/ARM/unwind.s
  tools/llvm-readobj/ARMEHABIPrinter.h
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