[MemProf] Fix callee guid for non-leaf frame (#172502) When matching callsite profile info, we synthesize VP metadata for matched indirect calls from the CalleeGuids recorded with the CallSite profile info. However, those are the callee guids of the leaf-most frame in the callsite. In cases where we match to a portion of the frames, not including the leaf, the callee guid should instead be synthesized from the next leaf-most frame in the list. This addresses the case where indirect call promotion was applied in the profiled binary during SamplePGO matching in a ThinLTO backend, where we didn't have VP metadata.
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