[clang] [flang] [flang][Frontend] Implement printing defined macros via -dM (PR #87627)

[Krzysztof Parzyszek via cfe-commits]

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@@ -83,6 +87,7 @@ class Parsing {
   const char *finalRestingPlace_{nullptr};
   std::optional<Program> parseTree_;
   ParsingLog log_;
+  std::unique_ptr<Preprocessor> preprocessor_;
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kparzysz wrote:

Done.

https://github.com/llvm/llvm-project/pull/87627