Use AOT snapshot of kernel_worker (#2591)

diff --git a/test_common/lib/sdk_asset_generator.dart b/test_common/lib/sdk_asset_generator.dart
index 65f4c0f..6175894 100644
--- a/test_common/lib/sdk_asset_generator.dart
+++ b/test_common/lib/sdk_asset_generator.dart
@@ -213,7 +213,7 @@
       ];
 
       _logger.fine('Executing dart ${args.join(' ')}');
-      final process = await Process.start(sdkLayout.dartPath, args,
+      final process = await Process.start(sdkLayout.dartAotRuntimePath, args,
           workingDirectory: sdkLayout.sdkDirectory);
 
       final output = <String>[];