xfs: consolidate incore inode radix tree posteof/cowblocks tags

mainline-inclusion
from mainline-v5.11-rc4
commit ce2d3bbe
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4KIAO
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ce2d3bbe06473fa76eb9dad21529f9cc48408000



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The clearing of posteof blocks and cowblocks serve the same purpose:
removing speculative block preallocations from inactive files.  We don't
need to burn two radix tree tags on this, so combine them into one.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lihong Kou <koulihong@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>