[clang] [flang] [llvm] seq_cst is allowed in Flush since OpenMP 5.1. (PR #114072)

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ShashwathiNavada wrote:

> Thanks for this patch. Could you update the title/summary of the patch to say that seq_cst is allowed in Flush since OpenMP 5.1. Also, might make sense to say why no other changes in Lowering to IR is required.
> 
> Could you add a test in flang/test/Lower/OpenMP/flush.f90 also for the Flang lowering?

@kiranchandramohan Thanks for the comment! I noticed this test doesn't cover other flush clauses like acq_rel, acquire or release. Do you think we need to add seq_cst specifically?

https://github.com/llvm/llvm-project/pull/114072