debug/dwarf: fail on reading incorrect offset due to skipped compilation unit

[danipozo]

Don't return incorrect offsets silently on Reader.Next(). Add SeekAndSetCU()
method to set the CU before reading entries to prevent this failure. Would
prevent and serve to fix go-delve/delve#3861 and parca-dev/parca#5291.

[aarzilli]

Shouldn't this be what Seek always does?

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[danipozo]

Shouldn't this be what Seek always does?

Actually, I think I agree. Probably we should discuss that in Gerrit as it is where review is supposed to happen (?)

I'll check again on this tomorrow, let's also see if someone more familiar with this module weighs in.

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