Fix initial-release nvcc v10.1 issue with thread_local.h #579
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As described in issue apache/mxnet#16612 and in PR dmlc/xgboost#4223, the nvcc of the initial cuda 10.1 release could at times fail to compile legitimate source code, with the error signature:
cannot call member function XXX without object. This PR supplies the same simple syntactic fix identified in the mentioned PR. Once MXNet is updated to pull in a dmlc-core with this fix, MXNet will compile robustly independent of cuda version. Thanks @rongou for leading me to this solution.@larroy @ptrendx