Never, EVER volunteer this information! They do not need to know. The only thing that prospective employers need to know is if you can perform adequately in a job scenario, remain drug free, and not steal from the company. NOTHING ELSE!
Whilst the Americans With Disabilities Act can make it appear easier for you to retain a job or gain employment, employers can and will use other excuses to let you go, or deny you opportunities for advancement in the workplace. They can have a handy excuse for letting you go, or denying you advancement. --More often than not, they can and will look for any excuse after you are known as 'Differant', be you of another Race, Gender,Sexual Orientation, or Psychiatrically Labeled.
Of which, of course, having an ASD is a psychiatric label. Employers do not need to know, and it is not required that you give them this information.
_________________
When There's No There to get to, I'm so There!