NV12 optimization turned back on now that unittest is fixed
BUG=55
TEST=unittest
Review URL: https://webrtc-codereview.appspot.com/813005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@366 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/row_posix.cc b/source/row_posix.cc
index 4440658..05173dd 100644
--- a/source/row_posix.cc
+++ b/source/row_posix.cc
@@ -1343,7 +1343,7 @@
 #define READNV12                                                               \
     "movq       (%[uv_buf]),%%xmm0             \n"                             \
     "lea        0x8(%[uv_buf]),%[uv_buf]       \n"                             \
-    "punpcklbw  %%xmm1,%%xmm0                  \n"                             \
+    "punpcklwd  %%xmm0,%%xmm0                  \n"                             \
 
 // Convert 8 pixels: 8 UV and 8 Y
 #define YUVTORGB                                                               \