[PATCH] [libcxx] Cleanup the cleanup of temporary files.

[Eric Fiselier]

Hi mclow.lists, danalbert, jroelofs,

The pythonic way to guard resources is using a `with` statement. This patch adds a class that allows the creation and deletion of temporary files using a `with` statement.

http://reviews.llvm.org/D6739

Files:
  test/lit.cfg

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