[PATCH] ARM IAS: refactor unwind context

[Saleem Abdulrasool]

  Address logan's comments.

Hi logan, rengolin, t.p.northover,

http://llvm-reviews.chandlerc.com/D2486

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2486?vs=6296&id=6300#toc

Files:
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  test/MC/ARM/eh-directive-fnstart-diagnostics.s
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