[clang] [clang-tools-extra] Reland [clang][Sema, Lex, Parse] Preprocessor embed in C and C++ (PR #95802)

[Eli Friedman via cfe-commits]

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efriedma-quic wrote:

Please don't commit binary files if it isn't absolutely necessary.  You can generate whatever files you need in a RUN line.

https://github.com/llvm/llvm-project/pull/95802