Move constant systems into their own libraries.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, 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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
 import '../compiler.dart' as api;
 
 import 'colors.dart' as colors;
+import 'constants/constant_system.dart' as constants;
 import 'constants/values.dart' as constants;
 import 'cps_ir/cps_ir_builder.dart' as ir_builder;
 import 'cps_ir/cps_ir_builder_task.dart' as ir_builder;
 import 'cps_ir/cps_ir_nodes_sexpr.dart' as cps_ir_nodes_sexpr;
 import 'tree_ir/tree_ir_nodes.dart' as tree_ir;
 import 'dart_types.dart' as dart_types;
 import 'dart2js.dart' as dart2js;
 import 'dart2jslib.dart' as dart2jslib;
 import 'elements/elements.dart' as elements;
 import 'elements/modelx.dart' as modelx;
@@ skipping 51 matching lines @@
   useProgramBuilder(null);
   useSemanticVisitor();
   useTreeVisitors();
 }
 
 useApi() {
   api.ReadStringFromUri uri;
 }
 
 void useConstant(constants.ConstantValue constant,
-                 dart2jslib.ConstantSystem cs) {
+                 constants.ConstantSystem cs) {
   constant.isObject;
   cs.isBool(constant);
 }
 
 void useNode(tree.Node node) {
   node
     ..asAsyncModifier()
     ..asAsyncForIn()
     ..asAwait()
     ..asBreakStatement()
@@ skipping 204 matching lines @@
   visitFieldDefinition(tree_ir.FieldDefinition node) {}
 
   visitFieldInitializer(tree_ir.FieldInitializer node) {}
   visitSuperInitializer(tree_ir.SuperInitializer node) {}
 }
 
 useTreeVisitors() {
   new DummyTreeVisitor().visitRootNode(null);
   new DummyTreeVisitor().visitInitializer(null);
 }