Access ConstantSystem through ClosedWorld.

pkg/compiler/lib/src/ssa/ssa_branch_builder.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.
 
 import '../compiler.dart';
 import '../io/source_information.dart';
 import '../js_backend/js_backend.dart';
 import '../tree/tree.dart' as ast;
 
 import 'graph_builder.dart';
@@ skipping 153 matching lines @@
         builder.push(new HNot(builder.pop(), builder.commonMasks.boolType));
       }
     }
 
     void visitThen() {
       right();
       boolifiedRight = builder.popBoolified();
     }
 
     handleIf(visitCondition, visitThen, null);
-    HConstant notIsAnd = builder.graph.addConstantBool(!isAnd, compiler);
+    HConstant notIsAnd =
+        builder.graph.addConstantBool(!isAnd, builder.closedWorld);
     HPhi result = new HPhi.manyInputs(
         null,
         <HInstruction>[boolifiedRight, notIsAnd],
         builder.commonMasks.dynamicType);
     builder.current.addPhi(result);
     builder.stack.add(result);
   }
 
   void _handleDiamondBranch(
       void visitCondition(), void visitThen(), void visitElse(),
@@ skipping 34 matching lines @@
         new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }