Pavel Labath 57a19ac336 Reapply "[lldb] Tolerate multiple compile units with the same DWO ID (#100577)" (#104041) ...

The only change vs. the first version of the patch is that I've made
DWARFUnit linking thread-safe/unit. This was necessary because, during
the
indexing step, two skeleton units could attempt to associate themselves
with the split unit.

The original commit message was:

I ran into this when LTO completely emptied two compile units, so they
ended up with the same hash (see #100375). Although, ideally, the
compiler would try to ensure we don't end up with a hash collision even
in this case, guaranteeing their absence is practically impossible. This
patch ensures this situation does not bring down lldb.

2024-08-15 13:34:03 +02:00

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