Fix missing sigmoid intrinsic in C++#2231
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This PR solves missing sigmoid intrinsic problem, visible when running C++ program, e.g. [1]. Python code is not affected because python libraries used to register their own fallback as follows:
https://github.com/dmlc/tvm/blob/master/python/tvm/intrin.py#L497
We solve the problem by moving default intrinsic from Python to C++
[1] - https://gist.github.com/grwlf/fafa70cde68cfc33b11c36bd20b3e6f0 failed program