block copies kill vars more precisely
block copies kill vars more precisely

test_prange3 example

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