[PATCH] Ignore contents of #if 0 blocks.

[Alexander Kornienko]

  Simplified preprocessor model, added if flase handling back.

Hi klimek, djasper,

http://llvm-reviews.chandlerc.com/D855

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D855?vs=2111&id=2122#toc

Files:
  lib/Format/UnwrappedLineParser.cpp
  lib/Format/UnwrappedLineParser.h
  unittests/Format/FormatTest.cpp
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