[K/N][codegen] Fixed improper linkage for private function

#KT-53346 Fixed

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/RTTIGenerator.kt

@@ -459,6 +459,8 @@ internal class RTTIGenerator(override val context: Context) : ContextUtils {
                     ""
             ) {
                 ret(getObjectValue(value, ExceptionHandler.Caller, startLocationInfo = null))
+            }.also {
+                LLVMSetLinkage(it, LLVMLinkage.LLVMPrivateLinkage)
             }
 
             Struct(runtime.associatedObjectTableRecordType, key.typeInfoPtr, constPointer(associatedObjectGetter))