[kernel] offsets on direct property get/set

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index aa9641b672f5901a4a675b1089cd4fb6f5e31dbc..4b54a6b3a6e18d57948015da6bc0869018489f25 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -687,11 +687,14 @@ class BinaryBuilder {
         return new SuperPropertySet.byReference(
             readName(), readExpression(), readMemberReference(allowNull: true));
       case Tag.DirectPropertyGet:
+        int offset = readOffset();
         return new DirectPropertyGet.byReference(
-            readExpression(), readMemberReference());
+            readExpression(), readMemberReference())..fileOffset = offset;
       case Tag.DirectPropertySet:
+        int offset = readOffset();
         return new DirectPropertySet.byReference(
-            readExpression(), readMemberReference(), readExpression());
+            readExpression(), readMemberReference(), readExpression())
+          ..fileOffset = offset;
       case Tag.StaticGet:
         int offset = readOffset();
         return new StaticGet.byReference(readMemberReference())