[CodeGen][XCore] Replace PointerType::getUnqual(Type) with opaque version (NFC) (#126279)

Follow-up to #123569

Author: junlarsen

clang/lib/CodeGen/Targets/XCore.cpp

@@ -149,7 +149,7 @@ RValue XCoreABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
   llvm::Type *ArgTy = CGT.ConvertType(Ty);
   if (AI.canHaveCoerceToType() && !AI.getCoerceToType())
     AI.setCoerceToType(ArgTy);
-  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy);
+  llvm::Type *ArgPtrTy = llvm::PointerType::getUnqual(ArgTy->getContext());
 
   Address Val = Address::invalid();
   CharUnits ArgSize = CharUnits::Zero();