[llvm] TargetInstrInfo: make getOperandLatency return optional (NFC) (PR #73769)

[Francesco Petrogalli via llvm-commits]

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@@ -1731,8 +1731,8 @@ class TargetInstrInfo : public MCInstrInfo {
 
   virtual unsigned getPredicationCost(const MachineInstr &MI) const;
 
-  virtual int getInstrLatency(const InstrItineraryData *ItinData,
-                              SDNode *Node) const;
+  virtual unsigned getInstrLatency(const InstrItineraryData *ItinData,
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fpetrogalli wrote:

`getOperandLatecy` is not the only interface you have modified in this patch. Please update the PR description/title accordingly.

https://github.com/llvm/llvm-project/pull/73769