tejohnson added a comment. How are you invoking this? Typically this path is invoked for distributed builds, when the individual index files for each backend were written during the thin link (e.g. via gold plugin's -thinlto-index-only option). In that case, we only expect a single summary to exist per GUID, since it is indicating which copy to import. We don't typically pass in the entire combined index (which would cause other issues as I believe we are simply importing every summary in the index on this path).
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