Remove c-11 memcpy checks from perf-critical code

Change-Id: Id4f37f5d4a03160572954a416efa1ef9b3d79ad1
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vppinfra/hash.h b/src/vppinfra/hash.h
index 892b2ea..59dbf8c 100644
--- a/src/vppinfra/hash.h
+++ b/src/vppinfra/hash.h
@@ -280,7 +280,7 @@
 {
   size_t ksz = hash_header (*h)->user;
   void *copy = clib_mem_alloc (ksz);
-  clib_memcpy (copy, key, ksz);
+  clib_memcpy_fast (copy, key, ksz);
   hash_set_mem (*h, copy, v);
 }