Create map of input arg to var.  Replace all ir.Arg using the input arg to var map.
Create map of input arg to var.  Replace all ir.Arg using the input arg to var map.

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