Remove the Kernel setup_builtin_library transformation

pkg/kernel/lib/target/vm.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.target.vm;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../core_types.dart';
 import '../transformations/continuation.dart' as cont;
 import '../transformations/erasure.dart';
 import '../transformations/insert_covariance_checks.dart';
 import '../transformations/insert_type_checks.dart';
 import '../transformations/mixin_full_resolution.dart' as mix;
 import '../transformations/sanitize_for_vm.dart';
-import '../transformations/setup_builtin_library.dart' as setup_builtin_library;
 import '../transformations/treeshaker.dart';
 import 'targets.dart';
 
 /// Specializes the kernel IR to the Dart VM.
 class VmTarget extends Target {
   final TargetFlags flags;
 
   VmTarget(this.flags);
 
   bool get strongMode => flags.strongMode;
@@ skipping 46 matching lines @@
       new InsertCovarianceChecks(hierarchy: _hierarchy, coreTypes: coreTypes)
           .transformProgram(program);
     }
 
     if (flags.treeShake) {
       performTreeShaking(program);
     }
 
     cont.transformProgram(program);
 
-    // Repair `_getMainClosure()` function in dart:_builtin.
-    setup_builtin_library.transformProgram(program);
-
     if (strongMode) {
       performErasure(program);
     }
 
     new SanitizeForVM().transform(program);
   }
 
   void performTreeShaking(Program program) {
     var coreTypes = new CoreTypes(program);
     new TreeShaker(program,
             hierarchy: _hierarchy,
             coreTypes: coreTypes,
             strongMode: strongMode,
             programRoots: flags.programRoots)
         .transform(program);
     _hierarchy = null; // Hierarchy must be recomputed.
   }
 
   void performErasure(Program program) {
     new Erasure().transform(program);
   }
 }