Fix table size in flatbuffers.

pkg/analyzer/lib/src/summary/flat_buffers.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 file.
 
 library analyzer.src.summary.flat_buffers;
 
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:math';
 import 'dart:typed_data';
@@ skipping 188 matching lines @@
     }
   }
 
   /**
    * End the current table and return its offset.
    */
   Offset endTable() {
     if (_currentVTable == null) {
       throw new StateError('Start a table before ending it.');
     }
-    // Prepare the size of the current table.
-    _currentVTable.tableSize = _tail - _currentTableEndTail;
     // Prepare for writing the VTable.
     _prepare(4, 1);
     int tableTail = _tail;
+    // Prepare the size of the current table.
+    _currentVTable.tableSize = tableTail - _currentTableEndTail;
     // Prepare the VTable to use for the current table.
     int vTableTail;
     {
       _currentVTable.computeFieldOffsets(tableTail);
       // Try to find an existing compatible VTable.
       for (_VTable vTable in _vTables) {
         if (_currentVTable.canUseExistingVTable(vTable)) {
           vTableTail = vTable.tail;
         }
       }
@@ skipping 535 matching lines @@
     // Table size.
     buf.setUint16(bufOffset, tableSize, Endianness.LITTLE_ENDIAN);
     bufOffset += 2;
     // Field offsets.
     for (int fieldOffset in fieldOffsets) {
       buf.setUint16(bufOffset, fieldOffset, Endianness.LITTLE_ENDIAN);
       bufOffset += 2;
     }
   }
 }