[CF 6058] Marking shared buffer lookup table as HASH_FIXED_SIZE

This branch was automatically generated by a robot using patches from an
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https://commitfest.postgresql.org/patch/6058

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Patch(es): https://www.postgresql.org/message-id/CAExHW5v0jh3F_wj86yC=qBfWk0uiT94qy=Z41uzAHLHh0SerRA@mail.gmail.com
Author(s): Ashutosh Bapat

Author: Commitfest Bot

src/backend/storage/buffer/buf_table.c

@@ -62,7 +62,7 @@ InitBufTable(int size)
 	SharedBufHash = ShmemInitHash("Shared Buffer Lookup Table",
 								  size, size,
 								  &info,
-								  HASH_ELEM | HASH_BLOBS | HASH_PARTITION);
+								  HASH_ELEM | HASH_BLOBS | HASH_PARTITION | HASH_FIXED_SIZE);
 }
 
 /*