Add skipCUDAIfRocm to test_nn test_softmax_results. (#38724)
Summary:
CC ezyang xw285cornell sunway513
Commit 59d92e442b88eae51b84adc4e902e36e8f12a4db (https://github.com/pytorch/pytorch/issues/38557) has caused this test to regularly fail on ROCm CI gfx900 hosts. Skipping test until root cause analysis can complete.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38724
Differential Revision: D21645815
Pulled By: xw285cornell
fbshipit-source-id: 4087e9565710c271ca5c026a5ae0c5132e56f44d
