Fix an issue with casting types in debig-info extension implementation

Author: VyacheslavLevytskyy

llvm/lib/Target/SPIRV/SPIRVEmitNonSemanticDI.cpp

@@ -330,7 +330,7 @@ bool SPIRVEmitNonSemanticDI::emitGlobalDI(MachineFunction &MF) {
         // If the Pointer is representing a void type it's getBaseType
         // is a nullptr
         const auto *MaybeNestedBasicType =
-            cast_or_null<DIBasicType>(PointerDerivedType->getBaseType());
+            dyn_cast_or_null<DIBasicType>(PointerDerivedType->getBaseType());
         if (MaybeNestedBasicType) {
           for (const auto &BasicTypeRegPair : BasicTypeRegPairs) {
             const auto &[DefinedBasicType, BasicTypeReg] = BasicTypeRegPair;

llvm/test/CodeGen/SPIRV/debug-info/debug-type-pointer.ll

@@ -81,8 +81,6 @@
 
 ; CHECK-OPTION-NOT: DebugTypePointer
 
-%struct_wrapper = type { i32 }
-
 @gi0 = dso_local addrspace(1) global ptr addrspace(4) null, align 4, !dbg !0
 @gv0 = dso_local addrspace(1) global ptr addrspace(4) null, align 4, !dbg !5