Vedant Kumar 20c54a3a30 [lit] Use os.devnull instead of named temp files
Use os.devnull instead of tempfiles when substituting '/dev/null' on
Windows machines. This should make the bots just a bit speedier.

Thanks to Yunzhong Gao for testing this patch on Windows!

Differential Revision: http://reviews.llvm.org/D20549

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272290 91177308-0d34-0410-b5e6-96231b3b80d8
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