[llvm] [mlir] [mlir][OpenMP] Allow composite SIMD REDUCTION and IF (PR #147568)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-debian-fast` running on `gribozavr4` while building `llvm,mlir` at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/56/builds/30915

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (checkout) failure: update (failure)

```

</details>

https://github.com/llvm/llvm-project/pull/147568