message: Remove obsolete comments and simplify code
diff: @@ -2199,9 +2199,6 @@ bool SwiftLanguageRuntime::GetDynamicTypeAndAddress_Struct(
  ValueObject &in_value, CompilerType &bound_type,
  lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name,
  Address &address) {
  - // struct can't inherit from each other, but they can be generic, in which
  - // case
  - // we need to turn MyStruct<U> into MyStruct<$swift.type.U>
  std::vector<CompilerType> generic_args;
  class_type_or_name.SetCompilerType(bound_type);
  @@ -2221,15 +2218,13 @@ bool SwiftLanguageRuntime::GetDynamicTypeAndAddress_Enum(
  ValueObject &in_value, CompilerType &bound_type,
  lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name,
  Address &address) {
  - // enums can't inherit from each other, but they can be generic, in which case
  - // we need to turn MyEnum<U> into MyEnum<$swift.type.U>
  std::vector<CompilerType> generic_args;
  class_type_or_name.SetCompilerType(bound_type);
  lldb::addr_t enum_address = in_value.GetPointerValue();
  - if (0 == enum_address || LLDB_INVALID_ADDRESS == enum_address)
  + if (!enum_address || LLDB_INVALID_ADDRESS == enum_address)
  enum_address = in_value.GetAddressOf(true, nullptr);
  - if (0 == enum_address || LLDB_INVALID_ADDRESS == enum_address) {
  + if (!enum_address || LLDB_INVALID_ADDRESS == enum_address) {
  if (false == SwiftASTContext::IsPossibleZeroSizeType(
  class_type_or_name.GetCompilerType()))
  return false;
  