Fix function lookup in cache for unhashable functions
Fix function lookup in cache for unhashable functions

cpcloud/numba,stuartarchibald/numba,gdementen/numba,pombredanne/numba,sklam/numba,stefanseefeld/numba,gmarkall/numba,gdementen/numba,GaZ3ll3/numba,seibert/numba,pombredanne/numba,ssarangi/numba,GaZ3ll3/numba,shiquanwang/numba,stuartarchibald/numba,pitrou/numba,shiquanwang/numba,GaZ3ll3/numba,gmarkall/numba,pitrou/numba,gmarkall/numba,sklam/numba,cpcloud/numba,numba/numba,stuartarchibald/numba,stonebig/numba,seibert/numba,GaZ3ll3/numba,stuartarchibald/numba,stonebig/numba,IntelLabs/numba,gmarkall/numba,IntelLabs/numba,stonebig/numba,stefanseefeld/numba,sklam/numba,IntelLabs/numba,seibert/numba,jriehl/numba,numba/numba,GaZ3ll3/numba,cpcloud/numba,shiquanwang/numba,ssarangi/numba,ssarangi/numba,gmarkall/numba,numba/numba,numba/numba,gdementen/numba,jriehl/numba,seibert/numba,cpcloud/numba,stefanseefeld/numba,ssarangi/numba,stonebig/numba,stefanseefeld/numba,pombredanne/numba,jriehl/numba,sklam/numba,gdementen/numba,pitrou/numba,ssarangi/numba,pombredanne/numba,IntelLabs/numba,stefanseefeld/numba,stonebig/numba,sklam/numba,seibert/numba,jriehl/numba,IntelLabs/numba,cpcloud/numba,numba/numba,pombredanne/numba,pitrou/numba,stuartarchibald/numba,pitrou/numba,jriehl/numba,gdementen/numba