[llvm] [llvm][CodeExtractor] fix bug in parameter naming (PR #114237)

[Tom Eccles via llvm-commits]

tblah wrote:

> Can I get an answer to my question whether you are going to review #114419? I am asking out of experience, several people abandoning a final review before, including the author(s) of the bug(s). It's frustrating for all the work put into it.

I will do my best but I think we also need at least one reviewer with some experience in this area.

https://github.com/llvm/llvm-project/pull/114237