Initialize fields of TypeRecord subclasses

[vitalybuka]

Summary

Detected by msan with:
-Xclang -enable-noundef-analysis -mllvm -msan-eager-checks=1

[rnk]

lgtm

llvm/include/llvm/DebugInfo/CodeView/TypeRecord.h

MemberPointerInfo(TypeIndex ContainingType,
       : ContainingType(ContainingType), Representation(Representation) {}
 
   TypeIndex getContainingType() const { return ContainingType; }
   PointerToMemberRepresentation getRepresentation() const {
     return Representation;
   }
 
   TypeIndex ContainingType;
-  PointerToMemberRepresentation Representation;
+  PointerToMemberRepresentation Representation =
+      PointerToMemberRepresentation::Unknown;
 };
 
 class TypeRecord {
 protected:
   TypeRecord() = default;
   explicit TypeRecord(TypeRecordKind Kind) : Kind(Kind) {}
 
 public:
public:
 
   TypeIndex getReturnType() const { return ReturnType; }
   CallingConvention getCallConv() const { return CallConv; }
   FunctionOptions getOptions() const { return Options; }
   uint16_t getParameterCount() const { return ParameterCount; }
   TypeIndex getArgumentList() const { return ArgumentList; }
 
   TypeIndex ReturnType;
-  CallingConvention CallConv;
-  FunctionOptions Options;
+  CallingConvention CallConv = CallingConvention::NearC;
+  FunctionOptions Options = FunctionOptions::None;
   uint16_t ParameterCount = 0;
   TypeIndex ArgumentList;
 };
 
 // LF_MFUNCTION
 class MemberFunctionRecord : public TypeRecord {
 public:
   MemberFunctionRecord() = default;
public:
   FunctionOptions getOptions() const { return Options; }
   uint16_t getParameterCount() const { return ParameterCount; }
   TypeIndex getArgumentList() const { return ArgumentList; }
   int32_t getThisPointerAdjustment() const { return ThisPointerAdjustment; }
 
   TypeIndex ReturnType;
   TypeIndex ClassType;
   TypeIndex ThisType;
-  CallingConvention CallConv;
-  FunctionOptions Options;
+  CallingConvention CallConv = CallingConvention::NearC;
+  FunctionOptions Options = FunctionOptions::None;
   uint16_t ParameterCount = 0;
   TypeIndex ArgumentList;
   int32_t ThisPointerAdjustment = 0;
 };
 
 // LF_LABEL
 class LabelRecord : public TypeRecord {
 public:
   LabelRecord() = default;
   explicit LabelRecord(TypeRecordKind Kind) : TypeRecord(Kind) {}
 
   LabelRecord(LabelType Mode) : TypeRecord(TypeRecordKind::Label), Mode(Mode) {}
 
-  LabelType Mode;
+  LabelType Mode = LabelType::Near;
 };
 
 // LF_MFUNC_ID
 class MemberFuncIdRecord : public TypeRecord {
 public:
   MemberFuncIdRecord() = default;
   explicit MemberFuncIdRecord(TypeRecordKind Kind) : TypeRecord(Kind) {}
   MemberFuncIdRecord(TypeIndex ClassType, TypeIndex FunctionType,
public:
 
   uint16_t getMemberCount() const { return MemberCount; }
   ClassOptions getOptions() const { return Options; }
   TypeIndex getFieldList() const { return FieldList; }
   StringRef getName() const { return Name; }
   StringRef getUniqueName() const { return UniqueName; }
 
   uint16_t MemberCount = 0;
-  ClassOptions Options;
+  ClassOptions Options = ClassOptions::None;
   TypeIndex FieldList;
   StringRef Name;
   StringRef UniqueName;
 };
 
 // LF_CLASS, LF_STRUCTURE, LF_INTERFACE
 class ClassRecord : public TagRecord {
 public:
TypeServer2Record(StringRef GuidStr, uint32_t Age, StringRef Name)
     assert(GuidStr.size() == 16 && "guid isn't 16 bytes");
     ::memcpy(Guid.Guid, GuidStr.data(), 16);
   }
 
   const GUID &getGuid() const { return Guid; }
   uint32_t getAge() const { return Age; }
   StringRef getName() const { return Name; }
 
-  GUID Guid;
+  GUID Guid = {};
   uint32_t Age = 0;
   StringRef Name;
 };
 
 // LF_STRING_ID
 class StringIdRecord : public TypeRecord {
 public:
   StringIdRecord() = default;