Fix source information positions for deserialized patched elements.

pkg/compiler/lib/src/elements/modelx.dart

Index: pkg/compiler/lib/src/elements/modelx.dart
diff --git a/pkg/compiler/lib/src/elements/modelx.dart b/pkg/compiler/lib/src/elements/modelx.dart
index e6304dfeed30a800bb6e90cef3aba59000219829..0f03ae64afe5cef8e44823a74a2dca79cb2654a9 100644
--- a/pkg/compiler/lib/src/elements/modelx.dart
+++ b/pkg/compiler/lib/src/elements/modelx.dart
@@ -3250,6 +3250,10 @@ abstract class AstElementMixin implements AstElement {
       body = node.asFunctionExpression().body;
     }
     return new ParsedResolvedAst(
-        declaration, node, body, definingElement.treeElements);
+        declaration,
+        node,
+        body,
+        definingElement.treeElements,
+        definingElement.compilationUnit.script.resourceUri);
   }
 }