[Bugfix]Fixing Anonymous Enum type in variant record

Summary

Fixes a bug where a anonymous type was not allowed for the case of a variant record if no switching field was declared

What is the current bug behavior?

type
  TTestRec = record
  case (A, B) of // Error expected Identifier but ( found
  A: (I: Integer);
  B: (D: Double);
  end;

What is the behavior after applying this patch?

The example above compiles now overlaying the A and the B branch of the case