[PATCH] Don't warn about Unicode characters in -E mode

[Jordan Rose]

  Treat raw-lexing mode like preprocessed-output mode, and preserve all the Unicode characters.

  This does have the unfortunate behavior of making our Unicode-whitespace-as-whitespace extension only enabled in non-preprocessed-output modes, which means preprocessing could end up expanding Unicode whitespace "tokens" all over the place.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D346

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D346?vs=812&id=816#toc

Files:
  include/clang/Frontend/PreprocessorOutputOptions.h
  include/clang/Lex/Preprocessor.h
  lib/Frontend/CompilerInstance.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Lex/Lexer.cpp
  test/Lexer/unicode.c
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