Fix source information positions for deserialized patched elements.

pkg/compiler/lib/src/ssa/codegen.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.
 
 import '../common.dart';
 import '../common/codegen.dart' show CodegenRegistry, CodegenWorkItem;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
@@ skipping 33 matching lines @@
     js.AsyncModifier asyncModifier = element.asyncMarker.isAsync
         ? (element.asyncMarker.isYielding
             ? const js.AsyncModifier.asyncStar()
             : const js.AsyncModifier.async())
         : (element.asyncMarker.isYielding
             ? const js.AsyncModifier.syncStar()
             : const js.AsyncModifier.sync());
 
     return new js.Fun(parameters, body, asyncModifier: asyncModifier)
         .withSourceInformation(sourceInformationFactory
-            .createBuilderForContext(resolvedAst.element)
+            .createBuilderForContext(resolvedAst)
             .buildDeclaration(resolvedAst));
   }
 
   js.Expression generateCode(CodegenWorkItem work, HGraph graph) {
     if (work.element.isField) {
       return generateLazyInitializer(work, graph);
     } else {
       return generateMethod(work, graph);
     }
   }
 
   js.Expression generateLazyInitializer(CodegenWorkItem work, HGraph graph) {
     return measure(() {
       compiler.tracer.traceGraph("codegen", graph);
       SourceInformation sourceInformation = sourceInformationFactory
-          .createBuilderForContext(work.element)
+          .createBuilderForContext(work.resolvedAst)
           .buildDeclaration(work.resolvedAst);
       SsaCodeGenerator codegen = new SsaCodeGenerator(backend, work);
       codegen.visitGraph(graph);
       return new js.Fun(codegen.parameters, codegen.body)
           .withSourceInformation(sourceInformation);
     });
   }
 
   js.Expression generateMethod(CodegenWorkItem work, HGraph graph) {
     return measure(() {
@@ skipping 2813 matching lines @@
     registry.registerStaticUse(new StaticUse.staticInvoke(
         helper, new CallStructure.unnamed(argumentCount)));
     return backend.emitter.staticFunctionAccess(helper);
   }
 
   @override
   void visitRef(HRef node) {
     visit(node.value);
   }
 }