Enable AVX2 in libvpx

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 80452237475c1cc9c82e249ad99db3883737cb88..0ce78c849a4fa5dc2dee3ba9a0a0cde0fd5b8fd5 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -127,22 +127,21 @@ static_library("libvpx_intrinsics_sse4_1") {
   }
 }
 
-# Uncomment when enabling AVX2
-#static_library("libvpx_intrinsics_avx2") {
-#  configs += [ ":libvpx_config" ]
-#  configs -= [ "//build/config/compiler:chromium_code" ]
-#  configs += [ "//build/config/compiler:no_chromium_code" ]
-#  if (is_win) {
-#    cflags = [ "/arch:AVX2" ]
-#  } else {
-#    cflags = [ "-mavx2" ]
-#  }
-#  if (cpu_arch == "x86") {
-#    sources = libvpx_srcs_x86_avx2
-#  } else if (cpu_arch == "x64") {
-#    sources = libvpx_srcs_x86_64_avx2
-#  }
-#}
+static_library("libvpx_intrinsics_avx2") {
+  configs += [ ":libvpx_config" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (is_win) {
+    cflags = [ "/arch:AVX2" ]
+  } else {
+    cflags = [ "-mavx2" ]
+  }
+  if (cpu_arch == "x86") {
+    sources = libvpx_srcs_x86_avx2
+  } else if (cpu_arch == "x64") {
+    sources = libvpx_srcs_x86_64_avx2
+  }
+}
 
 if (cpu_arch_full == "arm-neon-cpu-detect") {
   static_library("libvpx_intrinsics_neon") {
@@ -237,7 +236,7 @@ static_library("libvpx") {
       ":libvpx_intrinsics_sse2",
       ":libvpx_intrinsics_ssse3",
       ":libvpx_intrinsics_sse4_1",
-      #":libvpx_intrinsics_avx2",
+      ":libvpx_intrinsics_avx2",
     ]
   }
   if (cpu_arch_full == "arm-neon-cpu-detect") {