[Review]: Fix Integer Division Expansion special case of divide by 1

[Michael Ilseman]

Do you have a test case that demonstrates the failure before-hand, and the fix after? 

> On Jul 2, 2015, at 12:26 PM, Aditya Nandakumar <aditya_nandakumar at apple.com> wrote:
> 
> <DiffIntUnsignedDivision.patch>