TAKE - speed up acl enabled kernel

[Steve Lord <lord@sgi.com>]

This reduced the performance drop introduced when you turn on
the posix acl code. In the case where the code is turned on,
but no acls are present then the speed difference is now very
small.

Date:  Wed Feb 13 07:23:28 PST 2002
Workarea:  lord.americas.sgi.com:/src/lord/xfs-linux.2.4

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:111679a
linux/fs/xfs/xfs_attr_fetch.c - 1.9
linux/fs/xfs/xfs_attr.c - 1.86
	- Optimize the case where there are no extended attributes

linux/fs/xfs/xfs_dinode.h - 1.58
	- Remove endian conversion from some macros which are always used on
	  local byte order structures.