Fail integration test if expected bitcode markers not found (#102016)

dev/devicelab/bin/tasks/module_test_ios.dart

@@ -462,7 +462,7 @@ end
         if ((await fileType(builtFlutterBinary)).contains('armv7')) {
           throw TaskResult.failure('Unexpected armv7 architecture slice in $builtFlutterBinary');
         }
-        await containsBitcode(builtFlutterBinary);
+        await checkContainsBitcode(builtFlutterBinary);
 
         final String builtAppBinary = path.join(
           archivedAppPath,
@@ -474,7 +474,7 @@ end
         if ((await fileType(builtAppBinary)).contains('armv7')) {
           throw TaskResult.failure('Unexpected armv7 architecture slice in $builtAppBinary');
         }
-        await containsBitcode(builtAppBinary);
+        await checkContainsBitcode(builtAppBinary);
 
         // The host app example builds plugins statically, url_launcher_ios.framework
         // should not exist.

dev/devicelab/lib/framework/ios.dart

@@ -8,6 +8,7 @@ import 'dart:io';
 import 'package:path/path.dart' as path;
 
 import 'host_agent.dart';
+import 'task_result.dart';
 import 'utils.dart';
 
 typedef SimulatorFunction = Future<void> Function(String deviceId);
@@ -84,6 +85,12 @@ Future<bool> containsBitcode(String pathToBinary) async {
   return !emptyBitcodeMarkerFound;
 }
 
+Future<void> checkContainsBitcode(String pathToBinary) async {
+  if (!await containsBitcode(pathToBinary)) {
+    throw TaskResult.failure('Expected bitcode in $pathToBinary');
+  }
+}
+
 /// Creates and boots a new simulator, passes the new simulator's identifier to
 /// `testFunction`.
 ///