Import unmodified NetBSD libc in trunk

This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.

common/lib/libc/string/popcount64.c

@@ -0,0 +1,82 @@
+/*	$NetBSD: popcount64.c,v 1.5 2009/08/05 15:04:15 joerg Exp $	*/
+/*-
+ * Copyright (c) 2009 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Joerg Sonnenberger.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: popcount64.c,v 1.5 2009/08/05 15:04:15 joerg Exp $");
+
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+#include <limits.h>
+#include <strings.h>
+#else
+#include <lib/libkern/libkern.h>
+#include <machine/limits.h>
+#endif
+
+/*
+ * If uint64_t is larger than size_t, the follow assumes that
+ * splitting into 32bit halfes is faster.
+ *
+ * The native pocount64 version is based on the same ideas as popcount32(3),
+ * see popcount32.c for comments.
+ */
+
+#if SIZE_MAX < 0xffffffffffffffffULL
+unsigned int
+popcount64(uint64_t v)
+{
+	return popcount32((uint32_t)(v >> 32)) +
+	    popcount32((uint32_t)(v & 0xffffffffULL));
+}
+#else
+unsigned int
+popcount64(uint64_t v)
+{
+	unsigned int c;
+
+	v = v - ((v >> 1) & 0x5555555555555555ULL);
+	v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);
+	v = ((v + (v >> 4)) & 0x0f0f0f0f0f0f0f0fULL) * 0x0101010101010101ULL;
+	c = v >> 56;
+
+	return c;
+}
+#endif
+
+#if ULONG_MAX == 0xffffffffffffffffULL
+__strong_alias(popcountl, popcount64)
+#endif
+
+#if ULLONG_MAX == 0xffffffffffffffffULL
+__strong_alias(popcountll, popcount64)
+#endif
+