readelf: Handle DW_LLE_GNU_view_pair

DW_LLE_GNU_view_pair is used by gcc -gvariable-location-views=incompat5.
As described in http://www.fsfla.org/~lxoliva/papers/sfn/dwarf6-sfn-lvu.txt
and proposed for DWARF6 https://dwarfstd.org/ShowIssue.php?issue=170427.1

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