[PATCH] Ignore contents of #if 0 blocks.

[Alexander Kornienko]

  Found out that if false is used almost exclusively to check if 'false' is defined to 0 ;)
  Removed support for if false, changed test to ensure we don't ignore contents of if false.

Hi klimek, djasper,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D855?vs=2109&id=2111#toc

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