[llvm] [lit] Echo full RUN lines in case of external shells (PR #66408)

[Joel E. Denny via llvm-commits]

jdenny-ornl wrote:

> There seems to be a race condition of sorts which has caused the test shtest-run-at-line.py to be a bit unreliable on a Windows bot: https://lab.llvm.org/buildbot/#/builders/216

Thanks for pointing that out.  (And thanks for enabling FileCheck verbosity on this bot!)

>              8: bash.exe: warning: could not find /tmp, please create! 

Do you know why this is being printed at all?  Is it reasonable to just create that directory on that bot?

> Can the test be restructured such that it can handle this?

I'm concerned about weakening the test and missing other problems.  I might use `grep -v` to throw away that line.  Is that portable to windows?


https://github.com/llvm/llvm-project/pull/66408