[PATCH] Don't remove unknown tokens that are not whitespace (PR17215).

[Alexander Kornienko]

  Inlined the isWhitespace function.

Hi djasper,

http://llvm-reviews.chandlerc.com/D1858

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1858?vs=4736&id=4750#toc

Files:
  lib/Format/Format.cpp
  lib/Format/TokenAnnotator.cpp
  unittests/Format/FormatTest.cpp
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