[PATCH] Ignore contents of #if 0 blocks.

[Alexander Kornienko]

Hi klimek, djasper,

Added stack of preprocessor branching directives, and ignore all tokens
inside #if 0 except for preprocessor directives.

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

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