Neon version of I420ToNV12 and I420ToNV21.  NV21ToI420 added as function.  CopyRow changed to vld4.8 to allow unaligned copy.
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/922005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@435 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/rotate_argb.cc b/source/rotate_argb.cc
index 9c99446..7dcefa3 100644
--- a/source/rotate_argb.cc
+++ b/source/rotate_argb.cc
@@ -90,7 +90,7 @@
 #endif
   void (*CopyRow)(const uint8* src, uint8* dst, int width) = CopyRow_C;
 #if defined(HAS_COPYROW_NEON)
-  if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width * 4, 64)) {
+  if (TestCpuFlag(kCpuHasNEON) && IS_ALIGNED(width * 4, 32)) {
     CopyRow = CopyRow_NEON;
   }
 #endif