Enable AVX2 in libvpx

libvpx_srcs_x86_64_intrinsics.gypi

 # This file is generated. Do not edit.
 # Copyright (c) 2014 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.
 
 {
   'targets': [
     {
       'target_name': 'libvpx_intrinsics_mmx',
       'type': 'static_library',
@@ skipping 77 matching lines @@
       'conditions': [
         ['OS=="win" and clang==1', {
           # cl.exe's /arch flag doesn't have a setting for SSSE3/4, and cl.exe
           # doesn't need it for intrinsics. clang-cl does need it, though.
           'msvs_settings': {
             'VCCLCompilerTool': { 'AdditionalOptions': [ '-msse4.1' ] },
           },
         }],
       ],
     },
+    {
+      'target_name': 'libvpx_intrinsics_avx2',
+      'type': 'static_library',
+      'include_dirs': [
+        'source/config/<(OS_CATEGORY)/<(target_arch_full)',
+        '<(libvpx_source)',
+      ],
+      'sources': [
+        '<(libvpx_source)/vp9/common/x86/vp9_loopfilter_intrin_avx2.c',
+        '<(libvpx_source)/vp9/common/x86/vp9_subpixel_8t_intrin_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_dct32x32_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_dct_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_error_intrin_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_sad4d_intrin_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_sad_intrin_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_subpel_variance_impl_intrin_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_variance_avx2.c',
+        '<(libvpx_source)/vp9/encoder/x86/vp9_variance_impl_intrin_avx2.c',
+      ],
+      'cflags': [ '-mavx2', ],
+      'xcode_settings': { 'OTHER_CFLAGS': [ '-mavx2' ] },
+      'msvs_settings': {
+        'VCCLCompilerTool': {
+          'EnableEnhancedInstructionSet': '5', # /arch:AVX2
+        },
+      },
+    },
   ],
 }