[clang] [flang] [FLANG][MLIR][OpenMP] add MathToNVVM conversion pass to NVPTX MLIR (PR #180060)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while building `clang,flang` at step 12 "build-stage2-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/168/builds/18350

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

```
Step 12 (build-stage2-unified-tree) failure: build (failure) (timed out)
...
859.756 [62/11/6854] Linking CXX executable unittests/CodeGen/GlobalISel/GlobalISelTests
859.859 [62/10/6855] Linking CXX executable unittests/DebugInfo/LogicalView/DebugInfoLogicalViewTests
859.875 [62/9/6856] Linking CXX executable bin/clang-sycl-linker
859.938 [62/8/6857] Linking CXX executable unittests/Target/TargetMachineCTests
859.995 [62/7/6858] Linking CXX executable unittests/MIR/MIRTests
860.129 [62/6/6859] Linking CXX executable bin/opt
860.135 [62/5/6860] Linking CXX executable bin/clang-linker-wrapper
860.138 [62/4/6861] Linking CXX executable bin/llvm-split
860.319 [62/3/6862] Linking CXX executable bin/llvm-ir2vec
860.333 [62/2/6863] Linking CXX executable bin/dsymutil
command timed out: 1200 seconds without output running [b'ninja'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2060.923409

```

</details>

https://github.com/llvm/llvm-project/pull/180060