[SYCL] Remove usage of deprecated getPointerTo() in offloading tools(#16333)

Replace deprecated `getPointerTo()` with
`llvm::PointerType::get(LLVMContext)`.

Author: maarquitos14

clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp

@@ -409,7 +409,7 @@ class BinaryWrapper {
   std::pair<Constant *, Constant *>
   addStructArrayToModule(ArrayRef<Constant *> ArrayData, Type *ElemTy) {
 
-    auto *PtrTy = ElemTy->getPointerTo();
+    auto *PtrTy = llvm::PointerType::getUnqual(C);
 
     if (ArrayData.size() == 0) {
       auto *NullPtr = Constant::getNullValue(PtrTy);
@@ -917,8 +917,7 @@ class BinaryWrapper {
       PropRegistry = MySymPropReader->getPropRegistry();
     } else {
       if (PropRegistryFile.empty()) {
-        auto *NullPtr =
-            Constant::getNullValue(getSyclPropSetTy()->getPointerTo());
+        auto *NullPtr = Constant::getNullValue(llvm::PointerType::getUnqual(C));
         return std::pair<Constant *, Constant *>(NullPtr, NullPtr);
       }
       // load the property registry file

llvm/lib/Frontend/Offloading/SYCLOffloadWrapper.cpp

@@ -358,7 +358,7 @@ struct Wrapper {
   std::pair<Constant *, Constant *>
   addStructArrayToModule(ArrayRef<Constant *> ArrayData, Type *ElemTy) {
     if (ArrayData.empty()) {
-      auto *PtrTy = ElemTy->getPointerTo();
+      auto *PtrTy = llvm::PointerType::getUnqual(ElemTy->getContext());
       auto *NullPtr = Constant::getNullValue(PtrTy);
       return std::make_pair(NullPtr, NullPtr);
     }