[clang] [flang] [flang][OpenMP] Upstream first part of `do concurrent` mapping (PR #126026)

[Kareem Ergawy via cfe-commits]

ergawy wrote:

> LLVM Buildbot has detected a new failure on builder `ppc64-flang-aix` running on `ppc64-flang-aix-test` while building `clang,flang` at step 6 "test-build-unified-tree-check-flang".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/201/builds/3924
> Here is the relevant piece of the build log for the reference
> 
> ```
> Step 6 (test-build-unified-tree-check-flang) failure: test (failure)
> ******************** TEST 'Flang :: Driver/do_concurrent_to_omp_cli.f90' FAILED ********************
> Exit Code: 255
> 
> Command Output (stderr):
> --
> /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/flang --help | /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=FLANG # RUN: at line 3
> + /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/flang --help
> + /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=FLANG
> bbc --help | /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=BBC # RUN: at line 8
> + bbc --help
> + /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=BBC
> /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/flang -fdo-concurrent-to-openmp=host /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 2>&1  | /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=OPT # RUN: at line 13
> + /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/flang -fdo-concurrent-to-openmp=host /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90
> + /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/FileCheck /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/flang/test/Driver/do_concurrent_to_omp_cli.f90 --check-prefix=OPT
> 
> --
> 
> ********************
> ```

I we can just disable this test for powerpc. Opened a PR here: https://github.com/llvm/llvm-project/pull/134249.

https://github.com/llvm/llvm-project/pull/126026