Add vlib_buffer_enqueue_to_next inline function

Change-Id: I1042c0fe179b57a00ce99c8d62cb1bdbe24d9184
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vppinfra/vector_sse42.h b/src/vppinfra/vector_sse42.h
index cf7f158..50aa662 100644
--- a/src/vppinfra/vector_sse42.h
+++ b/src/vppinfra/vector_sse42.h
@@ -574,6 +574,12 @@
   return _mm_extract_epi16 ((__m128i) x, 0);
 }
 
+static_always_inline u16
+u8x16_msb_mask (u8x16 v)
+{
+  return _mm_movemask_epi8 ((__m128i) v);
+}
+
 #undef _signed_binop
 
 #endif /* included_vector_sse2_h */