Don't recreate CoreTypes in transformers. Pass it in.

pkg/kernel/lib/target/vmcc.dart

Index: pkg/kernel/lib/target/vmcc.dart
diff --git a/pkg/kernel/lib/target/vmcc.dart b/pkg/kernel/lib/target/vmcc.dart
index 028e58429eb8b40b084fa86dec4c116e331c73ee..ed4c6ddb4b94a85369b96109b0d5a9c8353f4296 100644
--- a/pkg/kernel/lib/target/vmcc.dart
+++ b/pkg/kernel/lib/target/vmcc.dart
@@ -4,8 +4,8 @@
 library kernel.target.vmcc;
 
 import '../ast.dart' show Program;
+import '../core_types.dart' show CoreTypes;
 import '../transformations/closure_conversion.dart' as cc show transformProgram;
-
 import 'targets.dart' show TargetFlags;
 import 'vm.dart' as vm_target;
 
@@ -16,8 +16,8 @@ class VmClosureConvertedTarget extends vm_target.VmTarget {
   String get name => "vmcc";
 
   @override
-  void performGlobalTransformations(Program program) {
-    super.performGlobalTransformations(program);
-    cc.transformProgram(program);
+  void performGlobalTransformations(CoreTypes coreTypes, Program program) {
+    super.performGlobalTransformations(coreTypes, program);
+    cc.transformProgram(coreTypes, program);
   }
 }