Make GsymResolver::find_line_info() report more error context #310
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We originally introduced find_line_info_impl() in
GsymResolver::find_line_info() to short circuit on the various error paths, because it was way too cumbersome to report custom errors on each.
By now we have the means for more concise error chaining and so we remove this internal function and report more detailed errors for each of the potential early returns.