readelf handle .debug_addr section.

readelf handle .debug_addr section.

Add debug-dump=addr which will show the .debug_addr section tables.
The only tricky bit is the fact that GNU DebugFission, a DWARF4
extension, didn't produce unit table headers. So if we see a mixed
DWARF4/5 .debug_addr table we have to reconstruct the table length
from the CU DIE DW_AT_[GNU_]_addr_base offsets.

Signed-off-by: Mark Wielaard <mark@klomp.org>