DWARFVerifier: Skip resolution failures for locations in dwo files

When reading location lists in dwo files the addresses cannot be
resolved, but that's not a problem.

Long term this probably should be fixed with a different API that
exposes location expressions without the need to resolve the address
ranges, since that's all the verifier (in its current state) requires.
(though the verifier should probably also eventually verify the address
ranges in location lists are a subset of the enclosing scope's address
range)