If the --debug option is set, the line number table of the elf binary will
be imported into the database. The information will be stored in the
"dbg_mapping" table.

If the --sources option is set, the source files will be imported
into the database. Only the files that were actually used in the
elf binary will be imported.

Change-Id: I0e9de6b456bc42b329c1700c25e5839d9552cdbb