[PATCH] Fix inline assembly that switches between ARM and Thumb modes

[Greg Fitzgerald]

  New in this patch:

  * adds .thumb/.arm directives after inline asm (because we don't parse it, and user might have switched modes and not switched back)
  * adds tests for inline asm that enters ARM or thumb mode and not going back
  * rebased on the latest code

Hi rengolin, grosbach, aemerson,

http://llvm-reviews.chandlerc.com/D2255

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2255?vs=6130&id=6479#toc

Files:
  include/llvm/MC/MCStreamer.h
  include/llvm/MC/MCTargetAsmParser.h
  lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  test/CodeGen/ARM/inlineasm-switch-mode-oneway-from-arm.ll
  test/CodeGen/ARM/inlineasm-switch-mode-oneway-from-thumb.ll
  test/CodeGen/ARM/inlineasm-switch-mode.ll
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