[ROCm] Update to ROCm 3.3 (#37247)
Summary:
CC ezyang .
ROCm 3.3 packages went live on 2020-04-01. Tag 376 was pushed on 2020-04-15, so it should be based on ROCm 3.3.
The upgrade to ROCm 3.3 is required as part of the effort to stabilize ROCm CI.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37247
Differential Revision: D21256198
Pulled By: ezyang
fbshipit-source-id: 92ac21c0122eda360ec279d2c3d462c3e6bf4646
