6333f8457c
Follow-up to #132003, in particular, see https://github.com/llvm/llvm-project/pull/132003#issuecomment-2739701936. This PR extends reduction support for `loop` directives. Consider the following scenario: ```fortran subroutine bar implicit none integer :: x, i !$omp teams loop reduction(+: x) DO i = 1, 5 call foo() END DO end subroutine ``` Note the following: * According to the spec, the `reduction` clause will be attached to `loop` during earlier stages in the compiler. * Additionally, `loop` cannot be mapped to `distribute parallel for` due to the call to a foreign function inside the loop's body. * Therefore, `loop` must be mapped to `distribute`. * However, `distribute` does not have `reduction` clauses. * As a result, we have to move the `reduction`s from the `loop` to its parent `teams` directive, which is what is done by this PR.
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