Updated scalar type to onnx mapping (#21095)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21095
ghimport-source-id: 32a79eace02216de9170f163027b1aa93756b821
Differential Revision: D15546175
Pulled By: izdeby
fbshipit-source-id: 4e47c8538aaf30b4af198baac7279133e4d74b36
