xfs: fixes for 6.4-rc5

This update contains:
- Propagate unlinked inode list corruption back up to log recovery (regression
  fix).
- improve corruption detection for AGFL entries, AGFL indexes and XEFI extents
  (syzkaller fuzzer oops report).
- Avoid double perag reference release (regression fix).
- Improve extent merging detection in scrub (regression fix).
- Fix a new undefined high bit shift (regression fix).
- Fix for AGF vs inode cluster buffer deadlock (regression fix).
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