[flang] [llvm] [flang][OpenMP] Decompose compound constructs, do recursive lowering (PR #90098)

[Tom Eccles via llvm-commits]

tblah wrote:

> How does it fail? Is it just different output, or are you seeing a crash?
All three hit assertion failures in Decomposer.cpp:96: "Construct decomposition failed". This looks the same as @psteinfeld's issue.

> Edit: I'll take a look at it to see what could potentially be cause of the problem. Some earlier version of the code had non-determinism in it, maybe I haven't fixed all of that...

Thank you

https://github.com/llvm/llvm-project/pull/90098