[llvm] [lit] Echo full RUN lines in case of external shells (PR #65267)

[Joel E. Denny via llvm-commits]

jdenny-ornl wrote:

Here's the fix: <https://github.com/jdenny-ornl/llvm-project/commit/61e272e9e20c5eda98f9132c3f24388abf443a83>

Unfortunately, I made the mistake of pushing the revert directly to git (old workflow) instead of clicking the revert button here in the PR.  I'm not sure how to reopen the PR now.  I can start a new PR if that's desirable.

https://github.com/llvm/llvm-project/pull/65267