Pass backend Target into Kernel driver.

pkg/front_end/lib/src/incremental_kernel_generator_impl.dart

Index: pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
diff --git a/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart b/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
index 851f6d66bef572f72f621c8403fe5ec607a221c0..eb961cb3c36fa4e2b4d88dfc30b41c1a5d21a923 100644
--- a/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
+++ b/pkg/front_end/lib/src/incremental_kernel_generator_impl.dart
@@ -11,6 +11,8 @@ import 'package:front_end/src/fasta/uri_translator.dart';
 import 'package:front_end/src/incremental/file_state.dart';
 import 'package:front_end/src/incremental/kernel_driver.dart';
 import 'package:kernel/kernel.dart' hide Source;
+import 'package:kernel/target/targets.dart';
+import 'package:kernel/target/vm_fasta.dart';
 import 'package:meta/meta.dart';
 
 /// Implementation of [IncrementalKernelGenerator].
@@ -56,8 +58,12 @@ class IncrementalKernelGeneratorImpl implements IncrementalKernelGenerator {
       return new Future.value();
     }
 
-    _driver = new KernelDriver(_logger, options.fileSystem, options.byteStore,
-        uriTranslator, options.strongMode,
+    _driver = new KernelDriver(
+        _logger,
+        options.fileSystem,
+        options.byteStore,
+        uriTranslator,
+        new VmFastaTarget(new TargetFlags(strongMode: options.strongMode)),
         fileAddedFn: onFileAdded);
   }