Add test for accessing dunder attr in jitclasses
Add test for accessing dunder attr in jitclasses

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