[llvm] [LLVM][NVPTX] Remove nonexistent ftz ops (PR #106100)

[Justin Fargnoli via llvm-commits]

justinfargnoli wrote:

Please add a test `FileCheck` that will fail without this PR. Also, add a regression test that causes `ptxas` to fail when the current compiler generates a `max.ftx.f16`. 

https://github.com/llvm/llvm-project/pull/106100