[PATCH] Pull Lexer's CharInfo table out for general use throughout Clang

[Jordan Rose]

  CharInfo widened to 16 bits (* 256 chars) to support `islower`, `ispunct`, and `isprint`.

Hi gribozavr, rsmith, bkramer, joerg,

http://llvm-reviews.chandlerc.com/D363

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D363?vs=892&id=916#toc

Files:
  include/clang/Basic/CharInfo.h
  lib/Basic/CMakeLists.txt
  lib/Basic/CharInfo.cpp
  lib/Lex/Lexer.cpp
  unittests/Basic/CMakeLists.txt
  unittests/Basic/CharInfoTest.cpp
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