Fix use of dangling pointer in heap_delete() when logging replica identity

When logging the replica identity of a deleted tuple, XLOG_HEAP_DELETE
records include references of the old tuple.  Its data is stored in an
intermediate variable used to register this information for the WAL
record, but this variable gets away from the stack when the record gets
actually inserted.

Spotted by clang's AddressSanitizer.

Author: Stas Kelvish
Discussion: https://postgr.es/m/085C8825-AD86-4E93-AF80-E26CDF03D1EA@postgrespro.ru
Backpatch-through: 9.4

Author: michaelpq

src/backend/access/heap/heapam.c

@@ -3343,6 +3343,7 @@ heap_delete(Relation relation, ItemPointer tid,
 	if (RelationNeedsWAL(relation))
 	{
 		xl_heap_delete xlrec;
+		xl_heap_header xlhdr;
 		XLogRecPtr	recptr;
 
 		/* For logical decode we need combocids to properly decode the catalog */
@@ -3377,8 +3378,6 @@ heap_delete(Relation relation, ItemPointer tid,
 		 */
 		if (old_key_tuple != NULL)
 		{
-			xl_heap_header xlhdr;
-
 			xlhdr.t_infomask2 = old_key_tuple->t_data->t_infomask2;
 			xlhdr.t_infomask = old_key_tuple->t_data->t_infomask;
 			xlhdr.t_hoff = old_key_tuple->t_data->t_hoff;