No, there is no AOT compiler for x86.
Now, even if it were like this:
a) it becomes much slower. Actually, it would be like making devices. The only time that was saved would be for deployment (which is not the largest part of the build / deployment time);
b) still give you different results than iOS devices. The iOS simulator is in many ways different from iOS devices, so testing on devices is very important.
Notes:
Many JIT exceptions are associated with using value types inside generics. This is largely fixed in versions 6.3.x (beta);
There are tricks to make your device faster. You can find here in stackoverflow and (soon) a video about my Evolve 2013 presentation should be available.
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