[lldb/test] Add basic ld.lld --debug-names tests (#88335)

Test that ld.lld --debug-names (#86508) built per-module index can be
consumed by lldb. This has uncovered a bug during the development of the
lld feature.

GitOrigin-RevId: a7e27260a92b7a40ede0c3ea4035733ea61e6571
2 files changed