Standard minhag is not to
http://hebrewbooks.org/pdfpager.aspx?req=46448&st=&pgnum=309
I have never seen it printed in a Hagada, obviously this isnt the strongest rayah, though it certainly indicates that the “standard” minhag is not to say it. (Of course it may be printers were cheap to print it so people stopped saying it, regardless it certainly indciates that it wasnt said.)
As always if your minhag is to say it, then by all means.
Incidently i’ve looked through old hagadahs and they (almost) never have Shir Hamalos printed before benching. I’m not sure why this is. Any thoughts?