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[ThinLTO] Shrink FunctionSummary by 8 bytes (#107706)
During the ThinLTO indexing step for one of our large applications, we create 4 million instances of FunctionSummary. Changing: std::vector<EdgeTy> CallGraphEdgeList; to: SmallVector<EdgeTy, 0> CallGraphEdgeList; in FunctionSummary reduces the size of each instance by 8 bytes. The rest of the patch makes the same change to other places so that the types stay compatible across function boundaries.
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