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

[Tuur Martens via cfe-commits]

JohnyTheCarrot wrote:

Ping. Requested changes were made. Apologies if this ping is misplaced, I made it in good faith.

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

You mean during the merge phase, right?

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