[clang] [llvm] [CIR][CUDA] Shadow variables, internalize device side variables, lower poison attribute (PR #190087)

[David Rivera via cfe-commits]

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

LGTM. Please wait for @koparasy's stamping. Left one suggestion inline about the global replacement hook.

You may also update the title and description according to the changes made here.



https://github.com/llvm/llvm-project/pull/190087