Distinguish XLOG_FPI records generated for hint-bit updates.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 0bd624d63b056205fda17a2d694d91db16468e3f
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-11-24T09:09:08Z
Releases: 9.5.0
Distinguish XLOG_FPI records generated for hint-bit updates.

Add a new XLOG_FPI_FOR_HINT record type, and use that for full-page images
generated for hint bit updates, when checksums are enabled. The new record
type is replayed exactly the same as XLOG_FPI, but allows them to be tallied
separately e.g. in pg_xlogdump.

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