Enable NEON for unittests on ios 64 bit.

TBR=kjellander@chromium.org
BUG=libyuv:637, chromium:646279

Review URL: https://codereview.chromium.org/2340933005 .

BUILD.gn

@@ -182,9 +182,6 @@ if (libyuv_include_tests) {
     if (is_linux) {
       cflags = [ "-fexceptions" ]
     }
-    if (is_ios && target_cpu=="arm64") {
-      defines += [ "LIBYUV_DISABLE_NEON" ]
-    }
     if (is_ios) {
       configs -= [ "//build/config/compiler:default_symbols" ]
       configs += [ "//build/config/compiler:symbols" ]
@@ -246,10 +243,6 @@ if (libyuv_include_tests) {
     ]
     deps = [ ":libyuv" ]
 
-    if (is_ios && target_cpu=="arm64") {
-      # TODO(fbarchard): Enable Neon. See https://crbug.com/646279
-      defines = [ "LIBYUV_DISABLE_NEON" ]
-    }
     if (!is_ios && !libyuv_disable_jpeg) {
       defines = [ "HAVE_JPEG" ]
     }

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1618
+Version: 1619
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1618
+#define LIBYUV_VERSION 1619
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

libyuv_test.gyp

@@ -52,11 +52,6 @@
             '-fexceptions',
           ],
         }],
-        [ 'OS == "ios" and target_subarch == 64', {
-          'defines': [
-            'LIBYUV_DISABLE_NEON'
-          ],
-        }],
         [ 'OS == "ios"', {
           'xcode_settings': {
             'DEBUGGING_SYMBOLS': 'YES',
@@ -151,12 +146,6 @@
         'libyuv.gyp:libyuv',
       ],
       'conditions': [
-        [ 'OS == "ios" and target_subarch == 64', {
-          'defines': [
-            'LIBYUV_DISABLE_NEON'
-          ],
-        }],
-
         [ 'OS != "ios" and libyuv_disable_jpeg != 1', {
           'defines': [
             'HAVE_JPEG',