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A long time ago, we had some metadata chunks which started at sector
boundary but not aligned to nodesize boundary.

This led to some older filesystems which can have tree blocks only
aligned to sectorsize, but not nodesize.

Later 'btrfs check' gained the ability to detect and warn about such tree
blocks, and kernel fixed the chunk allocation behavior, nowadays those
tree blocks should be pretty rare.

But in the future, if we want to migrate metadata to folio, we cannot
have such tree blocks, as filemap_add_folio() requires the page index to
be aligned with the folio number of pages.  Such unaligned tree blocks
can lead to VM_BUG_ON().

So this patch adds extra warning for those unaligned tree blocks, as a
preparation for the future folio migration.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>