Benjamin Kramer cbe40cfe96 Add warn_unused_result to empty() on various containers.
empty() doesn't actually empty out the container, making this a common typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190708 91177308-0d34-0410-b5e6-96231b3b80d8
2013-09-13 17:33:24 +00:00
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