xfs: always use iget in bulkstat

xfs: always use iget in bulkstat

commit 7dce11dbac54fce777eea0f5fb25b2694ccd7900 upstream.

The non-coherent bulkstat versionsthat look directly at the inode
buffers causes various problems with performance optimizations that
make increased use of just logging inodes.  This patch makes bulkstat
always use iget, which should be fast enough for normal use with the
radix-tree based inode cache introduced a while ago.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>