How does PhD admissions committee look at my old gre score after starting my Masters
I do not have experience from the perspective of a committee, but I believe that the general way to look at it is that the GRE scores, no matter how old they are, are simply another part of your application package, regardless of timing. 

There is no difference in consideration for undergraduates if their GRE is new or from their freshman year; I would imagine that there is no difference that you took your test before your Master's.