[PATCH v1] x86_64: Add memcmpeq.S to fix disable-multi-arch build

[Noah Goldstein]

The following commit:

    commit cf4fd28ea453d1a9cec93939bc88b58ccef5437a
    Author: Noah Goldstein <goldstein.w.n@gmail.com>
    Date:   Tue Oct 26 19:43:18 2021 -0500

Broke --disable-multi-arch build for x86_64 because x86_64/memcmpeq.S
was not defined outside of multiarch and the alias for __memcmpeq in
x86_64/memcmp.S was removed.

This commit fixes that issue by adding x86_64/memcmpeq.S.

make xcheck passes on x86_64 with and without --disable-multi-arch
---
 sysdeps/x86_64/memcmpeq.S | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 sysdeps/x86_64/memcmpeq.S

diff --git a/sysdeps/x86_64/memcmpeq.S b/sysdeps/x86_64/memcmpeq.S
new file mode 100644
index 0000000000..f3dd1d0085
--- /dev/null
+++ b/sysdeps/x86_64/memcmpeq.S
@@ -0,0 +1,23 @@
+/* __memcmpeq optimized with SSE2.
+   Copyright (C) 2017-2021 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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef memcmp
+# define memcmp	__memcmpeq
+#endif
+#define USE_AS_MEMCMPEQ	1
+#include "multiarch/memcmp-sse2.S"
-- 
2.25.1