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

pkg/kernel/lib/target/vmreify.dart

Index: pkg/kernel/lib/target/vmreify.dart
diff --git a/pkg/kernel/lib/target/vmreify.dart b/pkg/kernel/lib/target/vmreify.dart
index 1d0fe0a903400036628025bf4d6aaeb74fa852a0..17d2d52467c6ebb12c87faa159f5e7c9a4989c6f 100644
--- a/pkg/kernel/lib/target/vmreify.dart
+++ b/pkg/kernel/lib/target/vmreify.dart
@@ -4,9 +4,9 @@
 library kernel.target.vmreify;
 
 import '../ast.dart' show Program;
+import '../core_types.dart' show CoreTypes;
 import '../transformations/generic_types_reification.dart' as reify
     show transformProgram;
-
 import 'targets.dart' show TargetFlags;
 import 'vmcc.dart' as vmcc_target;
 
@@ -27,10 +27,10 @@ class VmGenericTypesReifiedTarget extends vmcc_target.VmClosureConvertedTarget {
   }
 
   @override
-  void performGlobalTransformations(Program program) {
-    super.performGlobalTransformations(program);
+  void performGlobalTransformations(CoreTypes coreTypes, Program program) {
+    super.performGlobalTransformations(coreTypes, program);
     // TODO(dmitryas) this transformation should be made modular
-    reify.transformProgram(program);
+    reify.transformProgram(coreTypes, program);
   }
 
   // Disable tree shaking for Generic Types Reification. There are some runtime
@@ -39,7 +39,7 @@ class VmGenericTypesReifiedTarget extends vmcc_target.VmClosureConvertedTarget {
   // the transformation.
   // TODO(dmitryas): remove this when the libraries are in dart:_internal
   @override
-  void performTreeShaking(Program program) {}
+  void performTreeShaking(CoreTypes coreTypes, Program program) {}
 
   // Here we disable Erasure pass of VmTarget class. The information deleted by
   // the Erasure pass is required for Generic Type Reification. Also, reify