[PATCH] Preprocessor: preserve whitespace in -traditional-cpp mode.

[Jordan Rose]

Hi rsmith,

This allows Lexer's "keep whitespace" mode to work for -E -traditional-cpp, which is used by people (ab)using the preprocessor to preprocess things other than C.

The internal uses we know about don't rely on the GNU behavior that whitespace is also preserved within macros, so this patch doesn't attempt to do that.

http://llvm-reviews.chandlerc.com/D399

Files:
  include/clang/Lex/Lexer.h
  lib/Lex/Lexer.cpp
  lib/Lex/PPDirectives.cpp
  test/Preprocessor/traditional-cpp.c
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