[AMDGPU][NFC] Remove isConstantAddr

[liaolucy]

Summary

fix isConstantAddr defined but not used

[liaolucy]

warning:

llvm-project/llvm/lib/Target/AMDGPU/AMDGPUPerfHintAnalysis.cpp:339:6: warning: ‘bool {anonymous}::AMDGPUPerfHint::isConstantAddr(const llvm::Value*) const’ defined but not used [-Wunused-function]
  339 | bool AMDGPUPerfHint::isConstantAddr(const Value *V) const {
      |      ^~~~~~~~~~~~~~

llvm/lib/Target/AMDGPU/AMDGPUPerfHintAnalysis.cpp

#endif
   /// y = a[i+1000];
   /// z = a[i+2000];
   /// In the above example, the second and third memory access will be marked
   /// large stride memory access.
   bool isLargeStride(const Instruction *Inst);
 
   bool isGlobalAddr(const Value *V) const;
   bool isLocalAddr(const Value *V) const;
-  bool isConstantAddr(const Value *V) const;
 };
 
 static std::pair<const Value *, const Type *> getMemoryInstrPtrAndType(
     const Instruction *Inst) {
   if (auto LI = dyn_cast<LoadInst>(Inst))
     return {LI->getPointerOperand(), LI->getType()};
   if (auto SI = dyn_cast<StoreInst>(Inst))
     return {SI->getPointerOperand(), SI->getValueOperand()->getType()};
AMDGPUPerfHint::makeMemAccessInfo(Instruction *Inst) const {
   if (isLocalAddr(MO))
     return MAI;
 
   MAI.V = MO;
   MAI.Base = GetPointerBaseWithConstantOffset(MO, MAI.Offset, *DL);
   return MAI;
 }
 
-bool AMDGPUPerfHint::isConstantAddr(const Value *V) const {
-  if (auto PT = dyn_cast<PointerType>(V->getType())) {
-    unsigned As = PT->getAddressSpace();
-    return As == AMDGPUAS::CONSTANT_ADDRESS ||
-           As == AMDGPUAS::CONSTANT_ADDRESS_32BIT;
-  }
-  return false;
-}
-
 bool AMDGPUPerfHint::MemAccessInfo::isLargeStride(
     MemAccessInfo &Reference) const {
 
   if (!Base || !Reference.Base || Base != Reference.Base)
     return false;
 
   uint64_t Diff = Offset > Reference.Offset ? Offset - Reference.Offset
                                             : Reference.Offset - Offset;