[clang] [Clang] Apply exclude_from_explicit_instantiation to dllimport/dllexport (PR #168171)

[Hans Wennborg via cfe-commits]

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@@ -6592,6 +6592,11 @@ void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) {
   // seem to be true in practice?
 
   for (Decl *Member : Class->decls()) {
+    if ((TSK == TSK_ExplicitInstantiationDeclaration ||
+         TSK == TSK_ExplicitInstantiationDefinition) &&
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zmodem wrote:

With the "exclude attribute takes precedence over dll attributes" approach, should we just drop the TSK checks here?

https://github.com/llvm/llvm-project/pull/168171