[clang] [HIP] Always add -fnative-half-arguments-and-returns cmdline option. (PR #113335)

[Christudasan Devadasan via cfe-commits]

cdevadas wrote:

### Merge activity

* **Oct 22, 12:36 PM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/113335).


https://github.com/llvm/llvm-project/pull/113335