New version of checksums patch.
* removed two duplicate lines; apparently the result of a bad merge
* Added heap page to WAL chain when logging an XLOG_HEAP2_VISIBLE to
avoid torn page issues updating PD_ALL_VISIBLE. This is the most
* minor comment cleanup
No open issues that I'm aware of with the patch itself.
Greg appears to have made some progress on the automated corruption
Note to reviewers: I also have a patch out to remove PD_ALL_VISIBLE
entirely. The code around PD_ALL_VISIBLE is quite tricky (with or
without this patch), so if the PD_ALL_VISIBLE patch is committed first
then it will make reviewing this patch easier. Regardless, the second
patch to be committed will need to be rebased on top of the first.
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