Add loop rotate to cheap pass
Add loop rotate to cheap pass

As title

gmarkall/numba,numba/numba,cpcloud/numba,seibert/numba,gmarkall/numba,stuartarchibald/numba,cpcloud/numba,gmarkall/numba,IntelLabs/numba,numba/numba,stuartarchibald/numba,IntelLabs/numba,numba/numba,numba/numba,cpcloud/numba,stonebig/numba,stonebig/numba,stuartarchibald/numba,IntelLabs/numba,cpcloud/numba,seibert/numba,stuartarchibald/numba,cpcloud/numba,gmarkall/numba,seibert/numba,IntelLabs/numba,seibert/numba,numba/numba,stonebig/numba,IntelLabs/numba,stuartarchibald/numba,stonebig/numba,seibert/numba,gmarkall/numba,stonebig/numba