[PATCH] Fix ARM unwind opcode assembler in several cases.

[Logan Chien]

  In the diff#2, a new test case eh-directive-integrated-test.s
  is added.  It is an equivalent test case of ehabi-mc.ll and
  ehabi-mc-section.ll written in ARM assembly, so that we can
  remove the .ll test cases in the future.

Hi asl,

http://llvm-reviews.chandlerc.com/D739

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D739?vs=1815&id=1968#toc

Files:
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
  lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.h
  test/CodeGen/ARM/ehabi-mc-section.ll
  test/CodeGen/ARM/ehabi-mc.ll
  test/MC/ARM/eh-directive-integrated-test.s
  test/MC/ARM/eh-directive-multiple-offsets.s
  test/MC/ARM/eh-directive-pad.s
  test/MC/ARM/eh-directive-save.s
  test/MC/ARM/eh-directive-setfp.s
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