Anonymous“As far as I know, bold "to" after "for" does not make "carry" a noun. It's just an
infinitive of purpose.
”
I don't know anyone that has considered carry a noun in "coming for to carry me home". What is odd is that an infinitive is used after a preposition in this phrase. We don't say:
I am interested in to hear it.
Let's talk about to go there.
He had an opportunity of to visit Cairo.
A gerund is used after prepositions and thus the song should go: "Swing low, sweet chariot, coming for carrying me home." That sounds ungrammatical, though! 
CB