mips optimized copy for all functions using CopyRows.
BUG=176
TEST=try bots
Review URL: https://webrtc-codereview.appspot.com/1074010

git-svn-id: http://libyuv.googlecode.com/svn/trunk@556 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/rotate_argb.cc b/source/rotate_argb.cc
index 880d1ea..02f928e 100644
--- a/source/rotate_argb.cc
+++ b/source/rotate_argb.cc
@@ -121,6 +121,11 @@
     CopyRow = CopyRow_SSE2;
   }
 #endif
+#if defined(HAS_COPYROW_MIPS)
+  if (TestCpuFlag(kCpuHasMIPS)) {
+    CopyRow = CopyRow_MIPS;
+  }
+#endif
   if (width * 4 > kMaxStride) {
     return;
   }