Remove PrintBufferDescs() and PrintPinnedBufs().

These have been #ifdef'd out for a long time, and in fact have
been uncompilable since commit 4835458 of 2016-04-10.  The
fact that nobody noticed for so long demonstrates their lack of
usefulness, so let's remove them rather than fix them.

Author: Jacob Brazeal <jacob.brazeal@gmail.com>
Discussion: https://postgr.es/m/CA+COZaB+9CN_f63PPRoVhHjYmCwwmb_9CWLxqCJdMWDqs1a-JA@mail.gmail.com

Author: tglsfdc

src/backend/storage/buffer/bufmgr.c

@@ -4412,64 +4412,6 @@ DropDatabaseBuffers(Oid dbid)
 	}
 }
 
-/* -----------------------------------------------------------------
- *		PrintBufferDescs
- *
- *		this function prints all the buffer descriptors, for debugging
- *		use only.
- * -----------------------------------------------------------------
- */
-#ifdef NOT_USED
-void
-PrintBufferDescs(void)
-{
-	int			i;
-
-	for (i = 0; i < NBuffers; ++i)
-	{
-		BufferDesc *buf = GetBufferDescriptor(i);
-		Buffer		b = BufferDescriptorGetBuffer(buf);
-
-		/* theoretically we should lock the bufhdr here */
-		elog(LOG,
-			 "[%02d] (freeNext=%d, rel=%s, "
-			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
-			 i, buf->freeNext,
-			 relpathbackend(BufTagGetRelFileLocator(&buf->tag),
-							INVALID_PROC_NUMBER, BufTagGetForkNum(&buf->tag)),
-			 buf->tag.blockNum, buf->flags,
-			 buf->refcount, GetPrivateRefCount(b));
-	}
-}
-#endif
-
-#ifdef NOT_USED
-void
-PrintPinnedBufs(void)
-{
-	int			i;
-
-	for (i = 0; i < NBuffers; ++i)
-	{
-		BufferDesc *buf = GetBufferDescriptor(i);
-		Buffer		b = BufferDescriptorGetBuffer(buf);
-
-		if (GetPrivateRefCount(b) > 0)
-		{
-			/* theoretically we should lock the bufhdr here */
-			elog(LOG,
-				 "[%02d] (freeNext=%d, rel=%s, "
-				 "blockNum=%u, flags=0x%x, refcount=%u %d)",
-				 i, buf->freeNext,
-				 relpathperm(BufTagGetRelFileLocator(&buf->tag),
-							 BufTagGetForkNum(&buf->tag)),
-				 buf->tag.blockNum, buf->flags,
-				 buf->refcount, GetPrivateRefCount(b));
-		}
-	}
-}
-#endif
-
 /* ---------------------------------------------------------------------
  *		FlushRelationBuffers
  *

src/include/storage/bufmgr.h

@@ -275,10 +275,6 @@ extern void DropDatabaseBuffers(Oid dbid);
 
 extern bool BufferIsPermanent(Buffer buffer);
 extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
-
-#ifdef NOT_USED
-extern void PrintPinnedBufs(void);
-#endif
 extern void BufferGetTag(Buffer buffer, RelFileLocator *rlocator,
 						 ForkNumber *forknum, BlockNumber *blknum);