[llvm] Do not emit right shift by 0 in DWARF expressions (PR #162738)

[Orlando Cazalet-Hyams via llvm-commits]

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

LGTM and makes sense - curious how you found this and/or if you have a motivating example?

https://github.com/llvm/llvm-project/pull/162738