message: Add Doxygen comments.
diff: @@ -287,7 +287,9 @@ public:
  struct IntegralTemplateArgument;
  + /// Return the size of the type in bytes.
  llvm::Optional<uint64_t> GetByteSize(ExecutionContextScope *exe_scope) const;
  + /// Return the size of the type in bits.
  llvm::Optional<uint64_t> GetBitSize(ExecutionContextScope *exe_scope) const;
  lldb::Encoding GetEncoding(uint64_t &count) const;
  