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

[Sergei Barannikov via cfe-commits]

https://github.com/s-barannikov approved this pull request.

Thanks, LGTM
(Please make sure to edit the description before merging so that `git log` does not contain irrelevant information.)

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