remove repeats for now: not sure how to handle
remove repeats for now: not sure how to handle

repeat blocks that contain barriers aren't always handled
correctly, because the barriers are placeholders and may
expand differently in different iterations -- something that
looks like exactly the same sequence of instructions repeated
N time might actually expand to N repetitions separated by
N-1 different barriers (some padded, some synchronized
by Waits...)

BBN-Q/pyqgl2,BBN-Q/pyqgl2