Remove c-11 memcpy checks from perf-critical code

Change-Id: Id4f37f5d4a03160572954a416efa1ef9b3d79ad1
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vnet/flow/flow.c b/src/vnet/flow/flow.c
index 485a845..4d867fe 100644
--- a/src/vnet/flow/flow.c
+++ b/src/vnet/flow/flow.c
@@ -47,7 +47,7 @@
 
   pool_get (fm->global_flow_pool, f);
   *flow_index = f - fm->global_flow_pool;
-  clib_memcpy (f, flow, sizeof (vnet_flow_t));
+  clib_memcpy_fast (f, flow, sizeof (vnet_flow_t));
   f->private_data = 0;
   f->index = *flow_index;
   return 0;