Fix missing func.__defaults__ due to #5935
Fix missing func.__defaults__ due to #5935

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