Summary: This reference to lit.util.capture is functionally identical to subprocess.check_output, so this change switches to call the library routine directly. Reviewers: mzolotukhin, EricWF Reviewed By: mzolotukhin Subscribers: sanjoy, llvm-commits Differential Revision: https://reviews.llvm.org/D34841 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@306755 91177308-0d34-0410-b5e6-96231b3b80d8