[Flang][OpenMP][OMPT] Warning for loop types not needed anymore

[Thyre]

Back in #63904, I've reported that the OpenMP Tools Interface implementation in LLVM fails to transfer the loop type to an attached tool, giving only a limited amount of information.

At some point between the reported issue and #97429, a warning was added for Flang explicitly:

OMP: Warning #189: OMPT: Cannot determine workshare type; using the default (loop) instead. This issue is fixed in an up-to-date compiler.

Back when the issue was not fixed in libomp, the warning was a bit weird, as the issue was not fixed in an up-to-date compiler. However, the issue is now irrelevant, as the information is transferred correctly:

program parallel_sum
    use omp_lib
    implicit none

    integer(8) :: sum
    integer :: i

    sum = 0

    call omp_set_num_threads( 2 )

    !$omp parallel do reduction(+:sum) default(none)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

    !$omp parallel do reduction(+:sum) default(none) schedule(static)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

    !$omp parallel do reduction(+:sum) default(none) schedule(dynamic)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

    !$omp parallel do reduction(+:sum) default(none) schedule(guided)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

    !$omp parallel do reduction(+:sum) default(none) schedule(auto)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

    !$omp parallel do reduction(+:sum) default(none) schedule(runtime)
    do i = 0, 99
        sum = sum + i
    end do
    !$omp end parallel do

end program parallel_sum

Attaching a basic information dumping tool, the following information is obtained:

$ flang --version
flang version 20.0.0git (https://github.com/llvm/llvm-project.git 77f8297c6fdaa62121ddb108043dcaad5c45c7ad)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/apps/software/Clang/trunk/bin
Build config: +assertions
$ flang -fopenmp test.f90
flang-20: warning: OpenMP support in flang is still experimental [-Wexperimental-option]
$ ./a.out | grep "callback_work"
OMP: Warning #189: OMPT: Cannot determine workshare type; using the default (loop) instead. This issue is fixed in an up-to-date compiler.
[0][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000001 (0x55b5b7030f60) | task_data->value = 555000002 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591b310
[0][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000001 (0x55b5b7030f60) | task_data->value = 555000002 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591b34d
[1][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000001 (0x55b5b7030f60) | task_data->value = 555000003 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591b310
[1][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000001 (0x55b5b7030f60) | task_data->value = 555000003 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591b34d
[0][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000002 (0x55b5b7030f60) | task_data->value = 555000004 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591b140
[0][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000002 (0x55b5b7030f60) | task_data->value = 555000004 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591b17d
[1][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000002 (0x55b5b7030f60) | task_data->value = 555000005 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591b140
[1][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000002 (0x55b5b7030f60) | task_data->value = 555000005 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591b17d
[0][callback_work] work_type = loop_dynamic | endpoint = begin | parallel_data->value = 666000003 (0x55b5b7030f60) | task_data->value = 555000006 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591af5f
[1][callback_work] work_type = loop_dynamic | endpoint = begin | parallel_data->value = 666000003 (0x55b5b7030f60) | task_data->value = 555000007 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591af5f
[0][callback_work] work_type = loop_dynamic | endpoint = end | parallel_data->value = 666000003 (0x55b5b7030f60) | task_data->value = 555000006 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591af82
[1][callback_work] work_type = loop_dynamic | endpoint = end | parallel_data->value = 666000003 (0x55b5b7030f60) | task_data->value = 555000007 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591af82
[0][callback_work] work_type = loop_guided | endpoint = begin | parallel_data->value = 666000004 (0x55b5b7030f60) | task_data->value = 555000008 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591ad8f
[1][callback_work] work_type = loop_guided | endpoint = begin | parallel_data->value = 666000004 (0x55b5b7030f60) | task_data->value = 555000009 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591ad8f
[1][callback_work] work_type = loop_guided | endpoint = end | parallel_data->value = 666000004 (0x55b5b7030f60) | task_data->value = 555000009 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591adb2
[0][callback_work] work_type = loop_guided | endpoint = end | parallel_data->value = 666000004 (0x55b5b7030f60) | task_data->value = 555000008 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591adb2
[0][callback_work] work_type = loop_guided | endpoint = begin | parallel_data->value = 666000005 (0x55b5b7030f60) | task_data->value = 555000010 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591abbf
[0][callback_work] work_type = loop_guided | endpoint = end | parallel_data->value = 666000005 (0x55b5b7030f60) | task_data->value = 555000010 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591abe2
[1][callback_work] work_type = loop_guided | endpoint = begin | parallel_data->value = 666000005 (0x55b5b7030f60) | task_data->value = 555000011 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591abbf
[1][callback_work] work_type = loop_guided | endpoint = end | parallel_data->value = 666000005 (0x55b5b7030f60) | task_data->value = 555000011 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591abe2
[0][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000006 (0x55b5b7030f60) | task_data->value = 555000012 (0x55b5b7039640) | count = 100 | codeptr_ra = 0x55b5b591a9ef
[0][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000006 (0x55b5b7030f60) | task_data->value = 555000012 (0x55b5b7039640) | count = 0 | codeptr_ra = 0x55b5b591aa12
[1][callback_work] work_type = loop_static | endpoint = begin | parallel_data->value = 666000006 (0x55b5b7030f60) | task_data->value = 555000013 (0x55b5b7039780) | count = 100 | codeptr_ra = 0x55b5b591a9ef
[1][callback_work] work_type = loop_static | endpoint = end | parallel_data->value = 666000006 (0x55b5b7030f60) | task_data->value = 555000013 (0x55b5b7039780) | count = 0 | codeptr_ra = 0x55b5b591aa12

This matches the information obtained with a C / C++ source code.
Therefore, the warning can probably just be removed.