Remove BTScanOpaqueData.firstPage

Alexander Korotkov <akorotkov@postgresql.org>

Commit: 06b10f80ba4db745f21847520b07b4ffad814313
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2023-12-27T12:21:49Z
Releases: 17.0
Remove BTScanOpaqueData.firstPage

It's not necessary to keep the firstPage flag as a field of BTScanOpaqueData.
This commit makes it an argument of the _bt_readpage() function.  We can easily
distinguish first-time and repeated calls (within the scan) of this function.

Reported-by: Peter Geoghegan
Discussion: https://postgr.es/m/CAH2-Wzk4SOsw%2BtHuTFiz8U9Jqj-R77rYPkhWKODCBb1mdHACXA%40mail.gmail.com
Reviewed-by: Pavel Borisov

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