Use AOT snapshot of kernel_worker (#2591)

Author: a-siva

test_common/lib/sdk_asset_generator.dart

@@ -213,7 +213,7 @@ class SdkAssetGenerator {
       ];
 
       _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>[];