[ROCm] work around compiler issue for IGammaKernel.cu

[jeffdaily]

Add const to static variable inside __host__ __device__ function.

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💊 CI failures summary and remediations

As of commit 86c3ef4 (more details on the Dr. CI page):

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✅ None of the CI failures appear to be your fault 💚

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• 1/1 broken upstream at merge base a66851a on Jan 22 from 1:38pm to 3:34pm

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🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

Check out the recency history of this "viable master" tracking branch.

• pytorch_windows_vs2019_py36_cuda10.1_test2 on Jan 22 from 1:38pm to 3:34pm (ca3ce77 - 7e10fbf)
  • 🔁 rerun

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@heitorschueroff has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

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@heitorschueroff merged this pull request in 0a4bc72.