remove SMG#getNullEdgesMapOffsetToSizeForObject
Remove SMG#getNullEdgesMapOffsetToSizeForObject
Remove the methods SMG#isCoveredByNullifiedBlocks and #getNullEdgesMapOffsetToSizeForObject.
Introduce SMGHasValueEdgeSet#getEdgeExactly(obj,ofs) for the only usage in SMGJoinFields#joinFieldsRelaxStatus.
Edited by Петров Олег Максимович