Accept DW_AT_GNU_call_site_* as attributes that hold location expressions

- These are extension attributes that correspond in behavior to
  attributes described in this proposal:
	http://www.dwarfstd.org/ShowIssue.php?issue=100909.2

- N.B.: DW_AT_call_site_data_location doesn't have a DW_AT_GNU_*
  counterpart.

Signed-off-by: Petr Machata <pmachata@redhat.com>
2 files changed