Call ReorderBufferProcessXid from sequence_decode
Commit
0da92dc530c added sequence_decode() implementing logical decoding
of sequences, but it failed to call ReorderBufferProcessXid() as it
should. So add the missing call.
Reported-by: Amit Kapila
Discussion: https://postgr.es/m/CAA4eK1KGn6cQqJEsubOOENwQOANsExiV2sKL52r4U10J8NJEMQ%40mail.gmail.com