[llvm] Revert "[GlobalISel] Add support for lowering byref attribute" (PR #96784)

[Gábor Spaits via llvm-commits]

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

Then I agree. For the first glance the PR original PR looks fine for me, but I also want to see some tests for that PR.

https://github.com/llvm/llvm-project/pull/96784