[polly] r248823 - Replace default destructors by {} destructors

[Johannes Doerfert via llvm-commits]

> Do you have a link (or just copy/paste inline) to the buildbot failure? I
> didn't spot it in any of the emails I got.
Maybe this helps:
  http://lab.llvm.org:8011/builders/polly-amd64-linux/builds/34603/steps/build_polly/logs/stdio
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