[llvm] [NVPTX] Fix ptxas requirements (PR #171219)

[Drew Kersnar via llvm-commits]

dakersnar wrote:

> That shouldn't be necessary here since I didn't change the triple or cpu for the llc invocations that get piped into FileCheck. Should I be updating those too?
Actually, yes, I'm wrong. You're correct, your version should pass. But regardless if we think that the other change is a more comprehensive fix, we should merge that one.

https://github.com/llvm/llvm-project/pull/171219