[PATCH] Support ANSI escape sequences in the Lexer

[Richard Smith]

Add support for ANSI escape sequences in the Lexer. In most cases, this merely provides a superior error recovery experience (we diagnose and skip over them, as we do with Unicode whitespace), but for ANSI color codes, normalize them and include them in identifiers, as suggested on slides 52 and 53 of this presentation by Bjarne Stroustrup:

https://parasol.tamu.edu/people/bs/622-GP/C++11TAMU.pdf

http://llvm-reviews.chandlerc.com/D3257

Files:
  lib/Lex/Lexer.cpp
  include/clang/Basic/DiagnosticLexKinds.td
  include/clang/Lex/Lexer.h
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