Windows Phone 8 applications (C#) get AOT compiled to machine code.

Here's an overview: http://www.silverlightshow.net/items/Windows-Phone-8-Compile...

Some video sessions:

[Deep Dive into the Kernel of .NET on WP8 - (talk about compilation starts around the 22 minute mark)] http://channel9.msdn.com/Events/Build/2012/3-005

[Inside Compiler in the Clound and MDIL] http://channel9.msdn.com/Shows/Going+Deep/Mani-Ramaswamy-and...