log XLogPrefetch stats at end of recovery

[Lakshmi N]

Hi,

While investigating a long recovery, I noticed that XLogPrefetch stats were
not logged at the end of recovery. This log message will be useful to
understand how effective XLogPrefetch was during recovery. Adding a patch
to address this.

Regards,
Lakshmi

0001-log-prefetch-stats-at-end-of-recovery.patch
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