[clang] [Clang] Allow simpler visibility annotations when targeting win32 and mingw (PR #133699)

[via cfe-commits]

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@@ -870,7 +873,8 @@ def NSReturnsMismatch : DiagGroup<"nsreturns-mismatch">;
 
 def IndependentClassAttribute : DiagGroup<"IndependentClass-attribute">;
 def UnknownAttributes : DiagGroup<"unknown-attributes">;
-def IgnoredAttributes : DiagGroup<"ignored-attributes">;
+def IgnoredAttributes : DiagGroup<"ignored-attributes",
+                                  [DllexportExplicitInstantiation]>;
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cor3ntin wrote:

Can you explain this change? It does not seem correct to me given the attribute has no spelling

https://github.com/llvm/llvm-project/pull/133699