[flang] [llvm] [FLANG][OpenMP]Add support for ALIGN clause on OMP ALLOCATE (PR #120791)

[Krzysztof Parzyszek via llvm-commits]

kparzysz wrote:

Could you add a semantic check that the value is a compile-time positive constant, and some tests for it?

https://github.com/llvm/llvm-project/pull/120791