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

[Saleem Abdulrasool]

Hi logan, t.p.northover,

Add support to llvm-readobj to decode the actual opcodes.  The ARM EHABI opcodes
are a variable length instruction set that describe the operations required for
properly unwinding stack frames.

The primary motivation for this change is to ease the creation of tests for the
ARM EHABI object emission as well as the unwinding directive handling in the ARM
IAS.

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

Files:
  tools/llvm-readobj/ARMEHABIPrinter.h
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