Remove redundant distributed transaction state.

The DTX_STATE_FORCED_COMMITTED was identical to
DTX_STATE_INSERTED_COMMITTED.

src/backend/access/transam/xact.c

@@ -1398,9 +1398,6 @@ RecordTransactionCommit(void)
 		if (max_wal_senders > 0)
 			WalSndWakeup();
 
-		if (isDtxPrepared)
-			forcedDistributedCommitted(&recptr);
-
 		/*
 		 * Now we may update the CLOG, if we wrote a COMMIT record above
 		 */

src/backend/cdb/cdbtm.c

@@ -777,7 +777,7 @@ doNotifyingCommitPrepared(void)
 
 	copyDirectDispatchFromTransaction(&direct);
 
-	Assert(currentGxact->state == DTX_STATE_FORCED_COMMITTED);
+	Assert(currentGxact->state == DTX_STATE_INSERTED_COMMITTED);
 	setCurrentGxactState(DTX_STATE_NOTIFYING_COMMIT_PREPARED);
 
 	if (strlen(currentGxact->gid) >= TMGIDSIZE)
@@ -1212,7 +1212,6 @@ rollbackDtxTransaction(void)
 				 currentGxact->gid);
 			break;
 
-		case DTX_STATE_FORCED_COMMITTED:
 		case DTX_STATE_NOTIFYING_COMMIT_PREPARED:
 		case DTX_STATE_INSERTING_COMMITTED:
 		case DTX_STATE_INSERTED_COMMITTED:
@@ -2259,21 +2258,6 @@ insertedDistributedCommitted(void)
 	setCurrentGxactState(DTX_STATE_INSERTED_COMMITTED);
 }
 
-
-/*
- * Change state to DTX_STATE_FORCED_COMMITTED.
- */
-void
-forcedDistributedCommitted(XLogRecPtr *recptr)
-{
-	elog(DTM_DEBUG5,
-		 "forcedDistributedCommitted entering in state = %s for gid = %s (xlog record %X/%X)",
-		 DtxStateToString(currentGxact->state), currentGxact->gid, recptr->xlogid, recptr->xrecoff);
-
-	Assert(currentGxact->state == DTX_STATE_INSERTED_COMMITTED);
-	setCurrentGxactState(DTX_STATE_FORCED_COMMITTED);
-}
-
 /* generate global transaction id */
 static DistributedTransactionId
 generateGID(void)

src/include/cdb/cdbtm.h

@@ -306,7 +306,6 @@ extern DistributedTransactionId getMaxDistributedXid(void);
 extern bool includeInCheckpointIsNeeded(TMGXACT *gxact);
 extern void insertingDistributedCommitted(void);
 extern void insertedDistributedCommitted(void);
-extern void forcedDistributedCommitted(XLogRecPtr *recptr);
 
 extern void redoDtxCheckPoint(TMGXACT_CHECKPOINT *gxact_checkpoint);
 extern void redoDistributedCommitRecord(TMGXACT_LOG *gxact_log);