Add information about NUMBA_DEBUG_ARRAY_OPT environment variable.
Add information about NUMBA_DEBUG_ARRAY_OPT environment variable.

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