[clang] Reland "[CUDA][HIP] Fix overloading resolution in global variable ini… (PR #65606)

[Artem Belevich via cfe-commits]

https://github.com/Artem-B approved this pull request.

LGTM.

I'm still figuring out the github-based workflow. One thing that may be useful in the future 
would be to start the pull request branch with the original/reverted commit and put the updates into separate commits, so one could see incremental changes, similar to what phabricator's "history" was providing.


https://github.com/llvm/llvm-project/pull/65606