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

[Peter Klausler via cfe-commits]

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@@ -49,15 +51,21 @@ class Definition {
 
   TokenSequence Apply(const std::vector<TokenSequence> &args, Prescanner &);
 
+  void Print(llvm::raw_ostream &out, llvm::StringRef macroName = "") const;
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klausler wrote:

`const char *` would be a more portable type for `macroName` for those who use this code outside llvm.

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