When a developer copy/pastes a failing command line into their
shell to rerun it, they have to manually delete the "RUN: at line
N:" prefix. To make life easier for such developers, let's make it
possible to copy/paste a command without needing to modify it while
still showing the line number in the output by moving the line number
to a comment at the end of the command line.
Reviewers: jroelofs, MaskRay
Reviewed By: jroelofs, MaskRay
Pull Request: https://github.com/llvm/llvm-project/pull/132485