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/session/session.h b/src/vnet/session/session.h
index 35c8fb4..ea21464 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -563,7 +563,7 @@
   session_pool_add_peeker (thread_index);
   new_s = session_alloc (current_thread_index);
   old_s = session_manager_main.wrk[thread_index].sessions + session_index;
-  clib_memcpy (new_s, old_s, sizeof (*new_s));
+  clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
   session_pool_remove_peeker (thread_index);
   new_s->thread_index = current_thread_index;
   new_s->session_index = session_get_index (new_s);