[PATCH] Don't remove backslashes from block comments.

[Alexander Kornienko]

Hi klimek,

Don't remove backslashes from block comments. Previously this
/* \    \ \ \ \ \
*/
would be turned to this:
/*
*/
which spoils some kinds of ASCII-art, people use in their comments. The behavior
was related to handling escaped newlines in block comments inside preprocessor
directives. This patch makes handling it in a more civilized way.

http://llvm-reviews.chandlerc.com/D979

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