[SandboxIR] Add extern templates for GlobalWithNodeAPI

This symbols need to be explicitly export for windows shared library builds
when explicitly visibility macros are enabled.

Author: fsfod

llvm/include/llvm/SandboxIR/Constant.h

@@ -1227,6 +1227,15 @@ class ConstantTokenNone final : public Constant {
 #endif
 };
 
+extern template class LLVM_TEMPLATE_ABI GlobalWithNodeAPI<
+    GlobalIFunc, llvm::GlobalIFunc, GlobalObject, llvm::GlobalObject>;
+extern template class LLVM_TEMPLATE_ABI GlobalWithNodeAPI<
+    Function, llvm::Function, GlobalObject, llvm::GlobalObject>;
+extern template class LLVM_TEMPLATE_ABI GlobalWithNodeAPI<
+    GlobalVariable, llvm::GlobalVariable, GlobalObject, llvm::GlobalObject>;
+extern template class LLVM_TEMPLATE_ABI GlobalWithNodeAPI<
+    GlobalAlias, llvm::GlobalAlias, GlobalValue, llvm::GlobalValue>;
+
 } // namespace llvm::sandboxir
 
 #endif // LLVM_SANDBOXIR_CONSTANT_H

llvm/lib/SandboxIR/Constant.cpp

@@ -291,6 +291,26 @@ GlobalT &GlobalWithNodeAPI<GlobalT, LLVMGlobalT, ParentT, LLVMParentT>::
   return cast<GlobalT>(*Ctx.getValue(&LLVMGV));
 }
 
+#if defined(__clang__) && __clang_major__  < 19 && defined(_MSC_VER) 
+template LLVM_EXPORT_TEMPLATE GlobalIFunc &
+GlobalWithNodeAPI<GlobalIFunc, llvm::GlobalIFunc, GlobalObject,
+                  llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalIFunc
+                                                                  &LLVMGV)
+    const;
+template LLVM_EXPORT_TEMPLATE Function &
+GlobalWithNodeAPI<Function, llvm::Function, GlobalObject, llvm::GlobalObject>::
+    LLVMGVToGV::operator()(llvm::Function &LLVMGV) const;
+
+template LLVM_EXPORT_TEMPLATE GlobalVariable &GlobalWithNodeAPI<
+    GlobalVariable, llvm::GlobalVariable, GlobalObject,
+    llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalVariable &LLVMGV)
+    const;
+template LLVM_EXPORT_TEMPLATE GlobalAlias &
+GlobalWithNodeAPI<GlobalAlias, llvm::GlobalAlias, GlobalValue,
+                  llvm::GlobalValue>::LLVMGVToGV::operator()(llvm::GlobalAlias
+                                                                 &LLVMGV) const;
+#endif
+
 // Explicit instantiations.
 template class GlobalWithNodeAPI<GlobalIFunc, llvm::GlobalIFunc, GlobalObject,
                                  llvm::GlobalObject>;