[llvm] [NVPTX] support packed f32 instructions for sm_100+ (PR #126337)

[Nikolay Panchenko via llvm-commits]

npanchen wrote:

@Prince781 due to this change we have lots of runtime errors, i.e. accuracy mismatch which #149393 does not solve.
If @bangtianliu observed this too, it's worth to revert that change.

https://github.com/llvm/llvm-project/pull/126337