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Following r297661, disable dup workaround to disable duplicate STDOUT…
… fd closing and instead directly prevent closing of STD* file descriptors. We do not want to close STDOUT as there may have been several uses of it such as the case: llc %s -o=- -pass-remarks-output=- -filetype=asm which cause multiple closes of STDOUT_FILENO and/or use-after-close of it. Using dup() in getFD doesn't work as we end up with original STDOUT_FILENO open anyhow. reviewed by Rafael Espindola Differential Revision: https://reviews.llvm.org/D31505 llvm-svn: 299098
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