[Reproducer] Use ::rtrim() to remove trailing control characters.

Pavel correctly pointed out that removing all control characters from
the working directory is overkill. It should be sufficient to just strip
the last ones.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@375259 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed