[llvm] [llvm][SystemZ] Recognize `@GOTENT` modifier in assembler. (PR #107038)

[Ulrich Weigand via llvm-commits]

https://github.com/uweigand approved this pull request.

>I'm unsure if there are other places that need to be updated for this.

No, this should be the only place.  Patch LGTM, thanks!

https://github.com/llvm/llvm-project/pull/107038