backup of the last group'descriptor when it is the 1st group of a meta_bg

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Hi Ted, Andreas and List,

As Andreas pointed out last year, if the last group is the 1st group
in a meta bg, then its group desc has no backup.
With meta_bg resizing inode is useless,  I had a thought that we store
a backup group descriptor of the last group in the resizing inode?
What's your opinions?

Yongqiang.
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