[clang] [clang] [diagnostics] Add `-fdiagnostics-add-output` switch for SARIF (PR #185201)

[Balázs Benics via cfe-commits]

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@@ -50,6 +50,15 @@ namespace clang {
 class SarifDocumentWriter;
 class SourceManager;
 
+struct SarifVersion {
+  StringRef SchemaVersion;
+  StringRef CommandLineVersion;
+  StringRef SchemaURI;
+  bool IsDefault;
+
+  bool isDefault() const { return IsDefault; }
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steakhal wrote:

This function is kind of overkill. Remember, one can pass the address of a non-static data member to `std::mem_fn` despite its suffixed with `_fn`. I know, it's weird.

https://github.com/llvm/llvm-project/pull/185201