+ * Update ThisTimeLineID to the timeline we're currently replaying,
+ * so that we install any recycled segments on that timeline.
+ * There is no guarantee that the WAL segments will be useful on the
+ * current timeline; if recovery proceeds to a new timeline right
+ * after this, the pre-allocated WAL segments on this timeline will
+ * not be used, and will go wasted until recycled on the next
+ * restartpoint. We'll live with that.
+ (void) GetXLogReplayRecPtr(&ThisTimeLineID);