Handle XLOG_OVERWRITE_CONTRECORD in DecodeXLogOp

Failing to do so results in inability of logical decoding to process the
WAL stream.  Handle it by doing nothing.

Backpatch all the way back.

Reported-by: Petr Jelínek <petr.jelinek@enterprisedb.com>

src/backend/replication/logical/decode.c

@@ -200,6 +200,7 @@ DecodeXLogOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 		case XLOG_FPI_FOR_HINT:
 		case XLOG_FPI:
 		case XLOG_FPI_MULTI:
+		case XLOG_OVERWRITE_CONTRECORD:
 			break;
 		default:
 			elog(ERROR, "unexpected RM_XLOG_ID record type: %u", info);