[LLD][ELF] Generically report "address assignment did not converge" (#128774)

There are considerable number of changes done in the address assignment
fixed point loop, and errors in any of them could cause address
assignment not to converge. However, this is reported to the user as
either "thunk creation not converged" or "relaxation not converged".

We saw a confused bug about this in the wild when spilling failed to
converge. (I'm working on a fix for that.)

We may eventually want a complete reason system when reporting address
assignment taking too many passes, but in the interim it seems prudent
to generalize the error message to "address assignment did not
converge".

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