[flang-commits] [flang] [flang] Fix slp-vectorize.f90 test (PR #133128)

[Tom Eccles via flang-commits]

tblah wrote:

Merging without review because this is affecting a buildbot https://github.com/llvm/llvm-project/pull/132801#issuecomment-2755130800

I can see other flang tests using `-o /dev/null` without disabling Windows so hopefully this works.

https://github.com/llvm/llvm-project/pull/133128