[lldb/DWARF] Fix v5 location lists for dwo files
Dwo files don't have a DW_AT_loclists_base -- set one explicitly. Also, make sure we use the correct location list flavour for v5.
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Dwo files don't have a DW_AT_loclists_base -- set one explicitly. Also, make sure we use the correct location list flavour for v5.