Adding the ability to use mmap instead of malloc for reading object section data.
Whether this improves library runtimes when reading gigabyte-plus object sections
is as yet unclear. It does not have significant impact on medium or smaller object
reading.
Improved the accuracy of dwarfdump's -k checking options with a much better
heuristic to get addresses from object data. Eliminates false error reports.
Checks for duplicate attributes in dwarf (generating an error) while
allowing callers to suppress the check.