[compiler] Fix lateinit isInitialized check in multi-file case(78b29349c9)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Context.kt

@@ -192,6 +192,7 @@ internal class SpecialDeclarationsFactory(val context: Context) : KotlinMangler
 }
 
 internal class Context(config: KonanConfig) : KonanBackendContext(config) {
+    override val lateinitNullableFields = mutableMapOf<IrField, IrField>()
     lateinit var frontendServices: FrontendServices
     lateinit var environment: KotlinCoreEnvironment
     lateinit var bindingContext: BindingContext