[IR][SPIR-V] Replace of PointerType::get(Type) with opaque version (NFC) (#124755)

Author: junlarsen

llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp

@@ -2176,14 +2176,8 @@ static SPIRVType *
 getOrCreateSPIRVDeviceEventPointer(MachineIRBuilder &MIRBuilder,
                                    SPIRVGlobalRegistry *GR) {
   LLVMContext &Context = MIRBuilder.getMF().getFunction().getContext();
-  Type *OpaqueType = StructType::getTypeByName(Context, "spirv.DeviceEvent");
-  if (!OpaqueType)
-    OpaqueType = StructType::getTypeByName(Context, "opencl.clk_event_t");
-  if (!OpaqueType)
-    OpaqueType = StructType::create(Context, "spirv.DeviceEvent");
-  unsigned SC0 = storageClassToAddressSpace(SPIRV::StorageClass::Function);
   unsigned SC1 = storageClassToAddressSpace(SPIRV::StorageClass::Generic);
-  Type *PtrType = PointerType::get(PointerType::get(OpaqueType, SC0), SC1);
+  Type *PtrType = PointerType::get(Context, SC1);
   return GR->getOrCreateSPIRVType(PtrType, MIRBuilder);
 }
 

llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp

@@ -629,7 +629,7 @@ SPIRVGlobalRegistry::getOrCreateConstNullPtr(MachineIRBuilder &MIRBuilder,
   unsigned AddressSpace = typeToAddressSpace(LLVMTy);
   // Find a constant in DT or build a new one.
   Constant *CP = ConstantPointerNull::get(
-      PointerType::get(::getPointeeType(LLVMTy), AddressSpace));
+      PointerType::get(LLVMTy->getContext(), AddressSpace));
   Register Res = DT.find(CP, CurMF);
   if (!Res.isValid()) {
     LLT LLTy = LLT::pointer(AddressSpace, PointerSize);