[clang] cuda clang: Move nvptx-surface.cu test to CodeGenCUDA (PR #134758)

[Austin Schuh via cfe-commits]

AustinSchuh wrote:

@Artem-B , 2 things.

1) Looks like I was too slow and had to fix merge conflicts.  Please take another look.
2) Can you submit?  I don't have submit permission yet, and realistically, unless you've got more requests for improvements to surface support, odds are low I'll be making enough changes going forward to justify it.

https://github.com/llvm/llvm-project/pull/134758