Oops. Unbreak the 9.1 build.

I forgot to "git add" latest changes after backpatching the changes
for previous commit.

src/backend/access/heap/heapam.c

@@ -1555,8 +1555,6 @@ heap_hot_search_buffer(ItemPointer tid, Relation relation, Buffer buffer,
 	offnum = ItemPointerGetOffsetNumber(tid);
 	at_chain_start = true;
 
-	heapTuple->t_self = *tid;
-
 	/* Scan through possible multiple members of HOT-chain */
 	for (;;)
 	{