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5255 uts shouldn't open-code ISP2

@@ -22,10 +22,11 @@
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
  * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
  */
 
+#include <sys/sysmacros.h>
 #include <sys/zfs_context.h>
 #include <sys/fm/fs/zfs.h>
 #include <sys/spa.h>
 #include <sys/txg.h>
 #include <sys/spa_impl.h>

@@ -117,11 +118,11 @@
                 size_t size = (c + 1) << SPA_MINBLOCKSHIFT;
                 size_t p2 = size;
                 size_t align = 0;
                 size_t cflags = (size > zio_buf_debug_limit) ? KMC_NODEBUG : 0;
 
-                while (p2 & (p2 - 1))
+                while (!ISP2(p2))
                         p2 &= p2 - 1;
 
 #ifndef _KERNEL
                 /*
                  * If we are using watchpoints, put each buffer on its own page,