[llvm] [AMDGPU] Add wave reduce intrinsics for float types - 1 (PR #161814)

[via llvm-commits]

easyonaadit wrote:

### Merge activity

* **Nov 20, 5:38 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/161814).


https://github.com/llvm/llvm-project/pull/161814