Reapply "[lit] Implement builtin umask (#94621)" (#155850) This reverts commit faa4e35c622c13c7a565b979a6676d6cf3040cd4. This was originally reverted because it was using a Python 3.9 feature (umask in subprocess.Popen) when LLVM only requires Python 3.8. This patch uses os.umask instead, which has been around for longer.
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