[PATCH] A first step towards giving format tokens pointer identity.

[Manuel Klimek]

Hi djasper,

With this patch, we create all tokens in one go before parsing and
pass an ArrayRef<FormatToken*> to the UnwrappedLineParser. The
UnwrappedLineParser is switched to use pointer-to-token internally.

The UnwrappedLineParser still copies the tokens into the UnwrappedLines.
This will be fixed in an upcoming patch.

http://llvm-reviews.chandlerc.com/D875

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