[llvm] [AutoUpgrade] Restrict NVVM bf16 intrinsic upgrades to integer storage types (PR #197387)

[via llvm-commits]

woruyu wrote:

> Changes LGTM. @woruyu , Could you look at the test failure ..? Do we need a negation to capture the valid error?

FileCheck use old text to match, I have fixed it!

https://github.com/llvm/llvm-project/pull/197387