Replace EXP_VOID_INTERPRET with VoidExp
Fix Issue 13468 - Wrong code when comparing class reference with typeof(null)
Merge pull request #4130 from WalterBright/voidexp

Replace EXP_VOID_INTERPRET with VoidExp
Merge pull request #4135 from yebblies/issue13468

Issue 13468 - Wrong code when comparing class reference with typeof(null)