[C++] Rewrite of the preprocessor.
This rewrite fixes a couple of issues with the pre-processor. It now supports: - macros in macro bodies - stringification of parameters [cpp.stringize] - the concatenation operator [cpp.concat] - #include MACRO_HERE - defined() inside macro bodies used in pp-conditions. Change-Id: Ifdb78041fb6afadf44f939a4bd66ce2832b8601f Reviewed-by: Roberto Raggi <email@example.com>
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