[NFC][TargetTransformInfo] Make getInliningThreholdMultiplier and getInlinerVectorBonusPercent const

[jmmartinez]

Thanks @jlebar !

llvm/include/llvm/Analysis/TargetTransformInfo.h

public:
   virtual const DataLayout &getDataLayout() const = 0;
   virtual InstructionCost getGEPCost(Type *PointeeType, const Value *Ptr,
                                      ArrayRef<const Value *> Operands,
                                      TTI::TargetCostKind CostKind) = 0;
   virtual InstructionCost
   getPointersChainCost(ArrayRef<const Value *> Ptrs, const Value *Base,
                        const TTI::PointersChainInfo &Info, Type *AccessTy,
                        TTI::TargetCostKind CostKind) = 0;
-  virtual unsigned getInliningThresholdMultiplier() = 0;
+  virtual unsigned getInliningThresholdMultiplier() const = 0;
   virtual unsigned adjustInliningThreshold(const CallBase *CB) = 0;
-  virtual int getInlinerVectorBonusPercent() = 0;
+  virtual int getInlinerVectorBonusPercent() const = 0;
   virtual InstructionCost getMemcpyCost(const Instruction *I) = 0;
   virtual unsigned
   getEstimatedNumberOfCaseClusters(const SwitchInst &SI, unsigned &JTSize,
                                    ProfileSummaryInfo *PSI,
                                    BlockFrequencyInfo *BFI) = 0;
   virtual InstructionCost getInstructionCost(const User *U,
                                              ArrayRef<const Value *> Operands,
                                              TargetCostKind CostKind) = 0;
public:
   }
   InstructionCost getPointersChainCost(ArrayRef<const Value *> Ptrs,
                                        const Value *Base,
                                        const PointersChainInfo &Info,
                                        Type *AccessTy,
                                        TargetCostKind CostKind) override {
     return Impl.getPointersChainCost(Ptrs, Base, Info, AccessTy, CostKind);
   }
-  unsigned getInliningThresholdMultiplier() override {
+  unsigned getInliningThresholdMultiplier() const override {
     return Impl.getInliningThresholdMultiplier();
   }
   unsigned adjustInliningThreshold(const CallBase *CB) override {
     return Impl.adjustInliningThreshold(CB);
   }
-  int getInlinerVectorBonusPercent() override {
+  int getInlinerVectorBonusPercent() const override {
     return Impl.getInlinerVectorBonusPercent();
   }
   InstructionCost getMemcpyCost(const Instruction *I) override {
     return Impl.getMemcpyCost(I);
   }
   InstructionCost getInstructionCost(const User *U,
                                      ArrayRef<const Value *> Operands,
                                      TargetCostKind CostKind) override {

llvm/include/llvm/CodeGen/BasicTTIImpl.h

InstructionCost getFPOpCost(Type *Ty) {
     // general.
     const TargetLoweringBase *TLI = getTLI();
     EVT VT = TLI->getValueType(DL, Ty);
     if (TLI->isOperationLegalOrCustomOrPromote(ISD::FADD, VT))
       return TargetTransformInfo::TCC_Basic;
     return TargetTransformInfo::TCC_Expensive;
   }
 
-  unsigned getInliningThresholdMultiplier() { return 1; }
+  unsigned getInliningThresholdMultiplier() const { return 1; }
   unsigned adjustInliningThreshold(const CallBase *CB) { return 0; }
 
-  int getInlinerVectorBonusPercent() { return 150; }
+  int getInlinerVectorBonusPercent() const { return 150; }
 
   void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
                                TTI::UnrollingPreferences &UP,
                                OptimizationRemarkEmitter *ORE) {
     // This unrolling functionality is target independent, but to provide some
     // motivation for its intended use, for x86:
 
     // According to the Intel 64 and IA-32 Architectures Optimization Reference

llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h

InstructionCost getShuffleCost(TTI::ShuffleKind Kind, VectorType *Tp,
                                  ArrayRef<int> Mask,
                                  TTI::TargetCostKind CostKind, int Index,
                                  VectorType *SubTp,
                                  ArrayRef<const Value *> Args = std::nullopt);
 
   bool areInlineCompatible(const Function *Caller,
                            const Function *Callee) const;
 
-  unsigned getInliningThresholdMultiplier() { return 11; }
+  unsigned getInliningThresholdMultiplier() const { return 11; }
   unsigned adjustInliningThreshold(const CallBase *CB) const;
 
-  int getInlinerVectorBonusPercent() { return 0; }
+  int getInlinerVectorBonusPercent() const { return 0; }
 
   InstructionCost getArithmeticReductionCost(
       unsigned Opcode, VectorType *Ty, std::optional<FastMathFlags> FMF,
       TTI::TargetCostKind CostKind);
 
   InstructionCost getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
                                         TTI::TargetCostKind CostKind);
   InstructionCost getMinMaxReductionCost(VectorType *Ty, VectorType *CondTy,
                                          bool IsUnsigned, FastMathFlags FMF,
                                          TTI::TargetCostKind CostKind);
 };
 
 } // end namespace llvm
 
 #endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUTARGETTRANSFORMINFO_H

llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h

public:
   // no incompatible functions in PTX, ptxas will throw errors in such cases.
   bool areInlineCompatible(const Function *Caller,
                            const Function *Callee) const {
     return true;
   }
 
   // Increase the inlining cost threshold by a factor of 11, reflecting that
   // calls are particularly expensive in NVPTX.
-  unsigned getInliningThresholdMultiplier() { return 11; }
+  unsigned getInliningThresholdMultiplier() const { return 11; }
 
   InstructionCost getArithmeticInstrCost(
       unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind,
       TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},
       TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},
       ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
       const Instruction *CxtI = nullptr);
 

llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h

 public:
   explicit SystemZTTIImpl(const SystemZTargetMachine *TM, const Function &F)
       : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
         TLI(ST->getTargetLowering()) {}
 
   /// \name Scalar TTI Implementations
   /// @{
 
-  unsigned getInliningThresholdMultiplier() { return 3; }
+  unsigned getInliningThresholdMultiplier() const { return 3; }
   unsigned adjustInliningThreshold(const CallBase *CB) const;
 
   InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,
                                 TTI::TargetCostKind CostKind);
 
   InstructionCost getIntImmCostInst(unsigned Opcode, unsigned Idx,
                                     const APInt &Imm, Type *Ty,
                                     TTI::TargetCostKind CostKind,