[flang-commits] [flang] [llvm] [flang] implement `split` for fortran 2023 (PR #161484)

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+! RUN: bbc -emit-fir -hlfir=false %s -o - | FileCheck %s
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c8ef wrote:

In this test case, we tested the following. Is it insufficient?

```fortran
call split(s1, s2, p)
call split(s1, s2, p, .true.)
```

https://github.com/llvm/llvm-project/pull/161484