Do not add nullability annotations to the methods of anonymous classes

Nullability annotations are useless for the methods of anonymous classes
due to their restricted scope.

^KT-62044: Fixed

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/AnnotationCodegen.kt

@@ -342,6 +342,7 @@ abstract class AnnotationCodegen(
 
         private fun isInvisibleForNullabilityAnalysis(declaration: IrDeclaration): Boolean =
             when {
+                (declaration.parent as? IrClass)?.isAnonymousObject == true -> true
                 declaration.origin.isSynthetic ->
                     true
                 declaration.origin == JvmLoweredDeclarationOrigin.INLINE_CLASS_GENERATED_IMPL_METHOD ||