[flang-commits] [flang] [flang] Repair recent Power build bot breakage (PR #124950)

[Kelvin Li via flang-commits]

kkwli wrote:

I see this when I fetch your branch.
```
! RUN: not %flang_fc1 %s 2>%t.stderr
! RUN: FileCheck %s --input-file=%t.stderr --check-prefixes=%if system-aix %{"PORTABILITY","WARNING","ERROR","AIX_WARNING"%} %else %{"PORTABILITY","WARNING","ERROR"%}
```

https://github.com/llvm/llvm-project/pull/124950