Remove use of deprecated getWithSamePointeeType() (#2096)

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@28e2408

Author: vmaksimo

llvm-spirv/lib/SPIRV/SPIRVLowerBitCastToNonStandardType.cpp

@@ -91,8 +91,7 @@ static Value *removeBitCasts(Value *OldValue, Type *NewTy, NFIRBuilder &Builder,
 
   if (auto *ASCI = dyn_cast<AddrSpaceCastInst>(OldValue)) {
     Builder.SetInsertPoint(ASCI);
-    Type *NewSrcTy = PointerType::getWithSamePointeeType(
-        cast<PointerType>(NewTy), ASCI->getSrcAddressSpace());
+    Type *NewSrcTy = PointerType::get(NewTy, ASCI->getSrcAddressSpace());
     Value *Pointer = removeBitCasts(ASCI->getPointerOperand(), NewSrcTy,
                                     Builder, InstsToErase);
     return RauwBitcasts(ASCI, Builder.CreateAddrSpaceCast(Pointer, NewTy));

llvm-spirv/lib/SPIRV/SPIRVToOCL20.cpp

@@ -217,8 +217,7 @@ void SPIRVToOCL20Base::visitCallSPIRVAtomicCmpExchg(CallInst *CI) {
               [=](IRBuilder<> &Builder, Value *Expected) {
                 Builder.CreateStore(Expected, PExpected);
                 unsigned AddrSpc = SPIRAS_Generic;
-                Type *PtrTyAS = PointerType::getWithSamePointeeType(
-                    cast<PointerType>(PExpected->getType()), AddrSpc);
+                Type *PtrTyAS = PointerType::get(PExpected->getType(), AddrSpc);
                 Value *V = Builder.CreateAddrSpaceCast(
                     PExpected, PtrTyAS, PExpected->getName() + ".as");
                 return std::make_pair(V, TypedPointerType::get(MemTy, AddrSpc));