[flang] [llvm] [Flang][OpenMP] Fix allocating arrays with size intrinisic (PR #119226)

[Sergio Afonso via llvm-commits]

https://github.com/skatrak approved this pull request.

I'm no expert on this, so I'd suggest waiting for another approval, but this LGTM. Thank you!

https://github.com/llvm/llvm-project/pull/119226