Sign in as Different User option missing in SharePoint 2013

Today i was trying to login to my SharePoint site using different user, but i couldn't find that option.
Then i came to know OOB SharePoint 2013 don't provide it.

Solution:
Follow below steps to get "Sign in as Different User" option

Go to SharePoint Server, open this path
C:\Program Files\Common Files\microsoft shared\Web ServerExtensions\15\TEMPLATE\CONTROLTEMPLATES\
Open Welcome.ascx

Search for ID = ID_RequestAcess




Paste above code above the tag ID = ID_RequestAcess