DBC: Adds simdbc64 target, adds arm64 arithmetic overflow logic

third_party/boringssl/boringssl_configurations.gypi

 # Copyright (c) 2015, 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.
 
 # This file is included to modify the configurations to build third-party
 # code from BoringSSL.
 # This code is C code, not C++, and is not warning-free, so we need to remove
 # C++-specific flags, and add flags to supress the warnings in the code.
 {
   'variables': {
@@ skipping 69 matching lines @@
         ],
       },
       # TODO(24321): Also disable temporarily on arm64. Reenable after the next
       # roll.
       'Dart_arm64_Base': {
         'abstract': 1,
         'defines': [
           'OPENSSL_NO_ASM',
         ],
       },
+      # Android 64-bit dbc build is for arm64, disable temporarily as well.
+      'Dart_Android_arm64_Base': {
+        'abstract': 1,
+        'defines': [
+          'OPENSSL_NO_ASM',
+        ],
+      },
       # When being built for Android nss expects __linux__ to be defined.
       'Dart_Android_Base': {
         'target_conditions': [
           ['_toolset=="host"', {
             'defines!': [
               'ANDROID',
             ],
             # Define __linux__ on Android build for NSS.
             'defines': [
               '__linux__',
@@ skipping 11 matching lines @@
             # Define __linux__ on Android build for NSS.
             'cflags!': [
               '-U__linux__',
             ],
           }]
         ],
       },
     },
   },
 }