[PATCH] Handle zero-width and double-width characters in string literals and comments.

[Alexander Kornienko]

Hi djasper,

Count column width instead of the number of code points. This also
includes correct handling of tabs inside string literals and comments (with an
exception of multiline string literals/comments, where tabs are present before
the first escaped newline).

http://llvm-reviews.chandlerc.com/D1601

Files:
  lib/Format/BreakableToken.cpp
  lib/Format/ContinuationIndenter.cpp
  lib/Format/Encoding.h
  lib/Format/Format.cpp
  lib/Format/FormatToken.h
  unittests/Format/FormatTest.cpp
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