avoid deep copy for IR
avoid deep copy for IR

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