[lldb][NativePDB] Fix uninitialized values found by msan.

Author: ZequanWu

lldb/source/Plugins/SymbolFile/NativePDB/UdtRecordCompleter.cpp

@@ -47,15 +47,18 @@ UdtRecordCompleter::UdtRecordCompleter(
   CVType cvt = m_index.tpi().getType(m_id.index);
   switch (cvt.kind()) {
   case LF_ENUM:
+    m_cvr.er.Options = ClassOptions::None;
     llvm::cantFail(TypeDeserializer::deserializeAs<EnumRecord>(cvt, m_cvr.er));
     break;
   case LF_UNION:
+    m_cvr.ur.Options = ClassOptions::None;
     llvm::cantFail(TypeDeserializer::deserializeAs<UnionRecord>(cvt, m_cvr.ur));
     m_layout.bit_size = m_cvr.ur.getSize() * 8;
     m_record.record.kind = Member::Union;
     break;
   case LF_CLASS:
   case LF_STRUCTURE:
+    m_cvr.cr.Options = ClassOptions::None;
     llvm::cantFail(TypeDeserializer::deserializeAs<ClassRecord>(cvt, m_cvr.cr));
     m_layout.bit_size = m_cvr.cr.getSize() * 8;
     m_record.record.kind = Member::Struct;