roll clang 161353:161757

third_party/libxml/libxml.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       # Define an "os_include" variable that points at the OS-specific generated
       # headers.  These were generated by running the configure script offline.
       ['os_posix == 1 and OS != "mac" and OS != "ios"', {
@@ skipping 229 matching lines @@
                   # pattern.c and uri.c both have an intentional
                   # `for (...);` / `while(...);` loop. I submitted a patch to
                   # move the `'` to its own line, but until that's landed
                   # suppress the warning:
                   '-Wno-empty-body',
                 ],
               },
               'cflags': [
                 '-Wno-pointer-sign',
                 '-Wno-empty-body',
+
+                # See http://crbug.com/138571#c8
+                '-Wno-ignored-attributes',
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }