[clang] [Clang][ssaf] Add missing instantiations of `Registry<JSONFormat::FormatInfo>` (PR #181806)

[Tomohiro Kashiwada via cfe-commits]

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@@ -19,6 +20,9 @@ using Value = llvm::json::Value;
 // ErrorBuilder - Fluent API for constructing contextual errors.
 //----------------------------------------------------------------------------
 
+template class CLANG_EXPORT_TEMPLATE
+    llvm::Registry<clang::ssaf::JSONFormat::FormatInfo>;
+
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kikairoya wrote:

`LLVM_INSTANTIATE_REGISTRY` declares with `LLVM_EXPORT_TEMPLATE`, but we need `CLANG_EXPORT_TEMPLATE` here for Windows dylib builds (not MinGW).

https://github.com/llvm/llvm-project/pull/181806