I believe they would be in legal range ... as typically Premiere sticks to the previous 'standards' that only view specific format/codecs in 'full'. Nearly all are 12-bit formats, most often DPX, and including all straight RGB formats.
So unless you're dealing with a 12-bit image sequence or RGB file, I would assume limited or "legal".
I'm wondering if that is still YUV or RGB? As for YUV, as much 12-bit is, that's still 'limited'.
But this is a tricky question. I wonder if @TrentHappel might be available, as he would know or be able to get a specific answer quickly. And I'll ask some colorist friends, they tend to know this in their sleep.