Move resolution/operators.dart to elements/operators.dart

pkg/compiler/lib/src/kernel/unresolved.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.md file.
 
 import 'package:kernel/ast.dart' as ir;
 
-import "../elements/resolution_types.dart"
-    show ResolutionDartType, ResolutionInterfaceType;
 import "../elements/elements.dart"
     show
         AstElement,
         ConstructorElement,
         Element,
         ErroneousElement,
         FunctionElement,
         MethodElement;
-import "../resolution/operators.dart"
+import "../elements/operators.dart"
     show AssignmentOperator, BinaryOperator, IncDecOperator, UnaryOperator;
+import "../elements/resolution_types.dart"
+    show ResolutionDartType, ResolutionInterfaceType;
 import "../tree/tree.dart" show Expression, NewExpression, Node, NodeList, Send;
 import "../universe/call_structure.dart" show CallStructure;
 import "../universe/selector.dart" show Selector;
 import 'accessors.dart';
 import "kernel.dart" show Kernel;
 
 abstract class UnresolvedVisitor {
   Kernel get kernel;
 
   // Implemented in KernelVisitor
@@ skipping 555 matching lines @@
     return buildUnresolvedSuperIndexAccessor(index, element)
         .buildNullAwareAssignment(visitForValue(rhs), null);
   }
 
   ir.Expression visitUnresolvedSuperSet(
       Send node, Element element, Node rhs, _) {
     return buildThrowUnresolvedSuperSetter(
         '${node.selector}', visitForValue(rhs));
   }
 }