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Now that the backup blocks are appended to the WAL record in xloginsert.c, XLogInsert doesn't see them anymore and cannot remove them from the version reconstructed for xlog_outdesc. This makes running with wal_debug=on more expensive, as we now make (unnecessary) temporary copies of the backup blocks, but it doesn't seem worth convoluting the code to keep that optimization. Reported by Alvaro Herrera.