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

pkg/kernel/lib/transformations/method_call.dart

Index: pkg/kernel/lib/transformations/method_call.dart
diff --git a/pkg/kernel/lib/transformations/method_call.dart b/pkg/kernel/lib/transformations/method_call.dart
index 26ee679af01fb4aa45cf47c15093dc1fc953134f..1dda53b5691f0056e6dc5c1b5a47dce8900c31b1 100644
--- a/pkg/kernel/lib/transformations/method_call.dart
+++ b/pkg/kernel/lib/transformations/method_call.dart
@@ -53,12 +53,15 @@ import '../visitor.dart';
 ///   var b = new B();
 ///   b.foo(499, named1: 88);
 /// }
-Program transformProgram(Program program, [debug = false]) {
-  new MethodCallTransformer(debug).visitProgram(program);
+Program transformProgram(CoreTypes coreTypes, Program program,
+    [debug = false]) {
+  new MethodCallTransformer(coreTypes, debug).visitProgram(program);
   return program;
 }
 
 class MethodCallTransformer extends Transformer {
+  final CoreTypes coreTypes;
+
   /// Keep track of "visited" procedures and constructors to not visit already
   /// visited stuff, nor visit newly created stubs.
   Set<Member> _visited = new Set<Member>();
@@ -105,16 +108,14 @@ class MethodCallTransformer extends Transformer {
 
   /// For noSuchMethod calls.
   ClassHierarchy hierarchy;
-  CoreTypes coreTypes;
   Constructor _invocationMirrorConstructor; // cached
   Procedure _listFrom; // cached
 
-  MethodCallTransformer(this._debug);
+  MethodCallTransformer(this.coreTypes, this._debug);
 
   @override
   TreeNode visitProgram(Program node) {
     hierarchy = new ClassHierarchy(node);
-    coreTypes = new CoreTypes(node);
 
     // First move body of all procedures that takes optional positional or named
     // parameters and record which non-static procedure names have optional