Fix GIN posting tree page deletion with incomplete splits.

aio: io_uring: Trigger async processing for large IOs

read stream: Split decision about look ahead for AIO and combining

read_stream: Only increase read-ahead distance when waiting for IO

heapam: Keep buffer pins across index scan resets.

heapam: Track heap block in IndexFetchHeapData.

Fix GIN multiple-VACUUM-scans pending list bug.

Fix GIN VACUUM posting tree root split bug.

GiST: Invalidate killed items consistently.

Track RI fast-path FK-check batches per firing cycle

Fix RI fast-path race with REINDEX CONCURRENTLY

Fix cross-type foreign keys in the batched fast-path FK check

GiST: Deprecate F_TUPLES_DELETED opaque area flag.

Add ssup_datum_uint32_cmp for comparing OIDs

Fix unlikely incremental tuple deform bug with missing attrs

Fix autovacuum-induced flakiness in backwards scan test.

Add test coverage for nbtree backwards scans.

Run nbtree test module tests under autoconf builds

Add _bt_set_startikey row compare test coverage.

Add tests for nbtree empty index predicate locking.

Fix another empty nbtree index SSI race.

Fix race in SSI interaction with empty btrees.

Fix race in SSI interaction with gin fast path.

Fix race in SSI interaction with bitmap heap scan.

Fix GiST index-only scan column alignment issue.

Use fake LSNs consistently in hash index AM.

Do not lock in BufferGetLSNAtomic() on archs with 8 byte atomic reads

Standardize cleanup lock terminology.

Clarify why _bt_killitems sorts its items array.

Return TIDs in desc order during backwards scans.

Avoid pointer chasing in _bt_readpage inner loop.

Relocate _bt_readpage and related functions.