BBlock: comment out wrong assertion
BBlock: comment out wrong assertion

This assertion does not hold anymore. We change it when
added labels to successor edges

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg