[BOLT][NFC] Remove unused BF::computeLocalUDChain method definition

[Amir]

Summary

The function is only used inside AArch64MCPlusBuilder class, there are no uses
of it as a BinaryFunction method.

[rafauler]

Thanks!

bolt/include/bolt/Core/BinaryFunction.h

private:
   void normalizeCFIState();
 
   /// Analyze and process indirect branch \p Instruction before it is
   /// added to Instructions list.
   IndirectBranchType processIndirectBranch(MCInst &Instruction, unsigned Size,
                                            uint64_t Offset,
                                            uint64_t &TargetAddress);
 
-  DenseMap<const MCInst *, SmallVector<MCInst *, 4>>
-  computeLocalUDChain(const MCInst *CurInstr);
-
   BinaryFunction &operator=(const BinaryFunction &) = delete;
   BinaryFunction(const BinaryFunction &) = delete;
 
   friend class MachORewriteInstance;
   friend class RewriteInstance;
   friend class BinaryContext;
   friend class DataReader;
   friend class DataAggregator;