Make NVVM initialization threadsafe
Make NVVM initialization threadsafe

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