[SampleProfile] Replace std::set with SmallVector in SortedCallTargetSet (NFC) (#208509) This patch replaces std::set with SmallVector and llvm::sort in SortedCallTargetSet and sortCallTargets. Since the keys in CallTargetMap are already guaranteed to be unique, using std::set for sorting allocates unnecessary tree nodes on the heap. This patch also removes unnecessary const from return-by-value types to enable move semantics. Assisted-by: Antigravity
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