Automerge: [LLDB][NativePDB] Fix name access for classes in CVTagRecord::name (#151190)

From
llvm/llvm-project#149876 (comment):
The `name()` accessor checked for `m_kind == Union` and accessed
`cvclass` instead of `cvunion`. This is technically wrong (maybe UB
even?).
In practice, this wasn't an issue, because all types in the union
(`ClassRecord`/`EnumRecord`/`UnionRecord`) inherit from `TagRecord`.

Author: Nerixyz

lldb/source/Plugins/SymbolFile/NativePDB/PdbUtil.h

@@ -65,7 +65,7 @@ struct CVTagRecord {
   }
 
   llvm::StringRef name() const {
-    if (m_kind == Struct || m_kind == Union)
+    if (m_kind == Struct || m_kind == Class)
       return cvclass.Name;
     if (m_kind == Enum)
       return cvenum.Name;