[clang] [clang] Fix --entry command line option (PR #69114)

[Tuur Martens via cfe-commits]

JohnyTheCarrot wrote:

Small update: I will be able to attend to the CI failure the around but no earlier than the 16th.
I appreciate the issue appears small, but I have a critically important assessment due that day, for which I can afford no distractions. I've put it in my calendar, though. See you soon!

https://github.com/llvm/llvm-project/pull/69114