[clang] [llvm] [NVPTX] Remove nvvm.ldg.global.* intrinsics (PR #112834)

[Artem Belevich via cfe-commits]

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

LGTM. Please add a note about the intrinsic removal/deprecation to the release notes.

https://github.com/llvm/llvm-project/pull/112834