Compute ids for IR nodes and check equivalence with the AST.

pkg/compiler/lib/src/kernel/kernel_visitor.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 'package:kernel/frontend/accessors.dart'
     show
         Accessor,
         IndexAccessor,
         NullAwarePropertyAccessor,
@@ skipping 1307 matching lines @@
       NodeList arguments,
       CallStructure callStructure,
       _) {
     return new ir.InvalidExpression();
   }
 
   @override
   ir.PropertyGet visitDynamicPropertyGet(
       Send node, Node receiver, Name name, _) {
     return associateNode(
-        new ir.PropertyGet(visitForValue(receiver), nameToIrName(name)), node);
+        new ir.PropertyGet(visitForValue(receiver), nameToIrName(name))
+          ..fileOffset = node.selector.getBeginToken().charOffset,
+        node);
   }
 
   @override
   ir.MethodInvocation visitDynamicPropertyInvoke(
       Send node, Node receiver, NodeList arguments, Selector selector, _) {
     return associateNode(
         buildInvokeSelector(
-            visitForValue(receiver), selector, buildArguments(arguments)),
+            visitForValue(receiver), selector, buildArguments(arguments))
+          ..fileOffset = node.selector.getBeginToken().charOffset,
         node);
   }
 
   @override
   ir.Expression handleDynamicCompounds(
       Send node, Node receiver, Name name, CompoundRhs rhs, _) {
     ir.Expression receiverNode =
         receiver == null ? new ir.ThisExpression() : visitForValue(receiver);
     ir.Expression compound = buildCompound(
         PropertyAccessor.make(receiverNode, nameToIrName(name), null, null),
@@ skipping 1593 matching lines @@
       : this(null, true, node, initializers);
 
   accept(ir.Visitor v) => throw "unsupported";
 
   visitChildren(ir.Visitor v) => throw "unsupported";
 
   String toString() {
     return "IrFunction($kind, $isConstructor, $node, $initializers)";
   }
 }