[llvm] [lit] Refactor available `ptxas` features (PR #154439)

[Justin Fargnoli via llvm-commits]

justinfargnoli wrote:

> Trying to see if I can trigger a build with the public build bot.

https://lab.llvm.org/buildbot/#/buildrequests/5249048?redirect_to_build=true

https://github.com/llvm/llvm-project/pull/154439