Move range_tree, btree, highbit64 to common code

Break out the range_tree, btree, and highbit64/lowbit64 code from kernel
space into shared kernel and userspace code.  This is needed for the
updated `zpool status -vv` error byte range reporting that will be
coming in a future commit.  That commit needs the range_tree code in
kernel and userspace.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #18133

cmd/Makefile.am

@@ -36,8 +36,8 @@ zhack_SOURCES = \
 zhack_LDADD = \
 	libzpool.la \
 	libzfs_core.la \
-	libnvpair.la
-
+	libnvpair.la \
+	librange_tree.la
 
 ztest_CFLAGS    = $(AM_CFLAGS) $(KERNEL_CFLAGS)
 ztest_CPPFLAGS  = $(AM_CPPFLAGS) $(LIBZPOOL_CPPFLAGS)

cmd/zdb/Makefile.am

@@ -14,6 +14,8 @@ zdb_LDADD = \
 	libzdb.la \
 	libzpool.la \
 	libzfs_core.la \
-	libnvpair.la
+	libnvpair.la \
+	libbtree.la \
+	librange_tree.la
 
 zdb_LDADD += $(LIBCRYPTO_LIBS)

cmd/zpool/zpool_util.c

@@ -114,29 +114,3 @@ array64_max(uint64_t array[], unsigned int len)
 
 	return (max);
 }
-
-/*
- * Find highest one bit set.
- * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
- */
-int
-highbit64(uint64_t i)
-{
-	if (i == 0)
-		return (0);
-
-	return (NBBY * sizeof (uint64_t) - __builtin_clzll(i));
-}
-
-/*
- * Find lowest one bit set.
- * Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
- */
-int
-lowbit64(uint64_t i)
-{
-	if (i == 0)
-		return (0);
-
-	return (__builtin_ffsll(i));
-}

cmd/zpool/zpool_util.h

@@ -45,8 +45,6 @@ void *safe_realloc(void *, size_t);
 void zpool_no_memory(void);
 uint_t num_logs(nvlist_t *nv);
 uint64_t array64_max(uint64_t array[], unsigned int len);
-int highbit64(uint64_t i);
-int lowbit64(uint64_t i);
 
 /*
  * Misc utility functions