[c10] remove warning attribute does not apply to any entity

[jspark1105]

Summary:
Remove warning

caffe2/c10/util/ArrayRef.h(278): warning: attribute does not apply to any entity

Test Plan: CI

Differential Revision: D20181191

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D20181191

[dr-ci]

💊 CircleCI build failures summary and remediations

As of commit c253f9e (more details on the Dr. CI page):

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

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• 1/1 broken upstream at merge base 9f7708e since Mar 02

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

  If your commit is newer than viable/strict, you can try basing on an older, stable commit:

  git fetch origin viable/strict
  git rebase --onto viable/strict $(git merge-base origin/master HEAD)
  

  If your commit is older than viable/strict:

  git fetch origin viable/strict
  git rebase viable/strict
  

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

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🚧 1 upstream failure recognized by patterns:

These were probably caused by upstream breakages:

• pytorch_linux_backward_compatibility_check_test from Mar 02

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This comment has been revised 3 times.

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D20181191

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D20181191

[facebook-github-bot]

This pull request has been merged in 82a177c.