[PATCH] ARM unwind directive parser, assembler, and testcases.

[Logan Chien]

  Compared with Diff 3, this patch enhance the diagnostics of the ARMAsmParser,
  and include several test cases for the diagnostics.

Hi grosbach, asl,

http://llvm-reviews.chandlerc.com/D692

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D692?vs=1719&id=1766#toc

Files:
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/MC/ARM/eh-compact-pr0.s
  test/MC/ARM/eh-compact-pr1.s
  test/MC/ARM/eh-directive-cantunwind-diagnostics.s
  test/MC/ARM/eh-directive-cantunwind.s
  test/MC/ARM/eh-directive-fnend-diagnostics.s
  test/MC/ARM/eh-directive-fnstart-diagnostics.s
  test/MC/ARM/eh-directive-handlerdata.s
  test/MC/ARM/eh-directive-pad-diagnostics.s
  test/MC/ARM/eh-directive-pad.s
  test/MC/ARM/eh-directive-personality-diagnostics.s
  test/MC/ARM/eh-directive-personality.s
  test/MC/ARM/eh-directive-save-diagnoatics.s
  test/MC/ARM/eh-directive-save.s
  test/MC/ARM/eh-directive-section-comdat.s
  test/MC/ARM/eh-directive-section-multiple-func.s
  test/MC/ARM/eh-directive-section.s
  test/MC/ARM/eh-directive-setfp-diagnostics.s
  test/MC/ARM/eh-directive-setfp.s
  test/MC/ARM/eh-directive-text-section-multiple-func.s
  test/MC/ARM/eh-directive-text-section.s
  test/MC/ARM/eh-directive-vsave-diagnostics.s
  test/MC/ARM/eh-directive-vsave.s
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