Pass down table relation into more index relation functions

This is done in preparation for logical decoding on standby, which needs to
include whether visibility affecting WAL records are about a (user) catalog
table. Which is only known for the table, not the indexes.

It's also nice to be able to pass the heap relation to GlobalVisTestFor() in
vacuumRedirectAndPlaceholder().

Author: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/21b700c3-eecf-2e05-a699-f8c78dd31ec7@gmail.com

src/backend/access/heap/heapam.c

@@ -8268,7 +8268,7 @@ bottomup_sort_and_shrink(TM_IndexDeleteOp *delstate)
  * update the heap page's LSN.
  */
 XLogRecPtr
-log_heap_visible(RelFileLocator rlocator, Buffer heap_buffer, Buffer vm_buffer,
+log_heap_visible(Relation rel, Buffer heap_buffer, Buffer vm_buffer,
 				 TransactionId snapshotConflictHorizon, uint8 vmflags)
 {
 	xl_heap_visible xlrec;

src/backend/access/heap/heapam_handler.c

@@ -822,9 +822,14 @@ heapam_relation_copy_for_cluster(Relation OldHeap, Relation NewHeap,
 								 *multi_cutoff);
 
 
-	/* Set up sorting if wanted */
+	/*
+	 * Set up sorting if wanted. NewHeap is being passed to
+	 * tuplesort_begin_cluster(), it could have been OldHeap too. It does not
+	 * really matter, as the goal is to have a heap relation being passed to
+	 * _bt_log_reuse_page() (which should not be called from this code path).
+	 */
 	if (use_sort)
-		tuplesort = tuplesort_begin_cluster(oldTupDesc, OldIndex,
+		tuplesort = tuplesort_begin_cluster(oldTupDesc, OldIndex, NewHeap,
 											maintenance_work_mem,
 											NULL, TUPLESORT_NONE);
 	else

src/backend/access/heap/vacuumlazy.c

@@ -2710,6 +2710,7 @@ lazy_vacuum_one_index(Relation indrel, IndexBulkDeleteResult *istat,
 	ivinfo.message_level = DEBUG2;
 	ivinfo.num_heap_tuples = reltuples;
 	ivinfo.strategy = vacrel->bstrategy;
+	ivinfo.heaprel = vacrel->rel;
 
 	/*
 	 * Update error traceback information.
@@ -2759,6 +2760,7 @@ lazy_cleanup_one_index(Relation indrel, IndexBulkDeleteResult *istat,
 
 	ivinfo.num_heap_tuples = reltuples;
 	ivinfo.strategy = vacrel->bstrategy;
+	ivinfo.heaprel = vacrel->rel;
 
 	/*
 	 * Update error traceback information.

src/backend/access/heap/visibilitymap.c

@@ -288,8 +288,7 @@ visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf,
 			if (XLogRecPtrIsInvalid(recptr))
 			{
 				Assert(!InRecovery);
-				recptr = log_heap_visible(rel->rd_locator, heapBuf, vmBuf,
-										  cutoff_xid, flags);
+				recptr = log_heap_visible(rel, heapBuf, vmBuf, cutoff_xid, flags);
 
 				/*
 				 * If data checksums are enabled (or wal_log_hints=on), we