lit/ProgressBar.py: [PR7919] Improve line wrap for XN-incapable terminals.

On Win32 console, emitting char to col#79 causes linefeed, and the cursor will not return to col#79 upper line with backspace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127696 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed