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Summary: ICF may fold functions in arbitrary order when running multi-threaded. This is fine in relocation mode as we end up with just one function holding all function symbols. However, in non-relocation mode we keep all function bodies, and if we keep merging profiles in non-deterministic order, we end up with functions with non deterministic profiles. The fix for non-relocation mode is to not merge profiles as the factual new profile could be different from the merged one since both function instances are potentially callable. Additionally, emit extra symbols for ICF functions in non-relocation mode to make it possible to track the folding. (cherry picked from FBD20889866)
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