[K/N] Don't use KonanIrModuleFragmentImpl in irText test pipeline

^KT-58240

native/native.tests/tests/org/jetbrains/kotlin/konan/ClassicFrontend2NativeIrConverter.kt

@@ -112,7 +112,7 @@ class ClassicFrontend2NativeIrConverter(
             sourceFiles,
             irProviders = listOf(irDeserializer),
             linkerExtensions = pluginExtensions,
-        ).toKonanModule()
+        )
 
         val pluginContext = IrPluginContextImpl(
             generatorContext.moduleDescriptor,
@@ -139,11 +139,6 @@ class ClassicFrontend2NativeIrConverter(
         )
     }
 
-    private fun IrModuleFragment.toKonanModule(): IrModuleFragment {
-        val konanIrModuleFragmentImplClass = kotlinNativeClass("org.jetbrains.kotlin.backend.konan.serialization.KonanIrModuleFragmentImpl")
-        return konanIrModuleFragmentImplClass.constructors.single().call(descriptor, irBuiltins, files) as IrModuleFragment
-    }
-
     private fun kotlinNativeClass(name: String): KClass<out Any> {
         // KT-61248: TODO Replace reflection for direct import, when classes would be extracted out of `backend.native` module
         return Class.forName(