S390: Use memcpy for forward cases in memmove.

The s390/s390x memcpy implementations are safe to be
used by memmove.  Starting with this commit, memmove is
using memcpy for the forward cases on s390.

ChangeLog:

	* sysdeps/s390/memcopy.h: New file.

1 files changed, 23 insertions, 0 deletions

diff --git a/sysdeps/s390/memcopy.h b/sysdeps/s390/memcopy.h
new file mode 100644
index 0000000000..9a76196502
--- /dev/null
+++ b/sysdeps/s390/memcopy.h
@@ -0,0 +1,23 @@
+/* memcopy.h -- definitions for memory copy functions.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdeps/generic/memcopy.h>
+
+/* The s390/s390x memcpy implementations are safe to be used by memmove.  */
+#undef MEMCPY_OK_FOR_FWD_MEMMOVE
+#define MEMCPY_OK_FOR_FWD_MEMMOVE 1