Record the physical offset of each segment in modules.log

Created by: snehasish

In order to support internal symbolization tools we would like to record the physical offset of each mapped segment. drmodtrack combines multiple adjacent segments into a single contiguous blob so multiple physical offsets could be mapped to the entry in the modules.log file. Since the modules.log format may already contain multiple entries for non contiguous mapped regions, clients should already handle the case of multiple entries for a single module.