xfs: create slab caches for frequently-used deferred items

mainline inclusion
from mainline-v5.15-rc4
commit f3c799c2
category: bugfix
bugzilla: 188883, https://gitee.com/openeuler/kernel/issues/I76JSK
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f3c799c22c661e181c71a0d9914fc923023f65fb



--------------------------------

Create slab caches for the high-level structures that coordinate
deferred intent items, since they're used fairly heavily.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>

Conflicts: fs/xfs/libxfs/xfs_defer.c
      fs/xfs/xfs_super.c
Signed-off-by: Long Li <leo.lilong@huawei.com>