xfs: update for 3.6-rc1

Numerous cleanups and several bug fixes.  Here are some highlights:

* Discontiguous directory buffer support
* Inode allocator refactoring
* Removal of the IO lock in inode reclaim
* Implementation of .update_time
* Fix for handling of EOF in xfs_vm_writepage
* Fix for races in xfsaild, and idle mode is re-enabled
* Fix for a crash in xfs_buf completion handlers on unmount.
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