[PATCH] D99888: [flang][OpenMP] Add semantic checks for occurrence of nested Barrier regions

[Arnamoy B via Phabricator via llvm-commits]

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This patch adds the following nesting check for `barrier` constructs:

  A barrier region may not be closely nested inside a worksharing, loop, task, taskloop, critical, ordered, atomic, or master region.

Also adds a test case for the check,


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99888

Files:
  flang/lib/Semantics/check-omp-structure.cpp
  flang/lib/Semantics/check-omp-structure.h
  flang/test/Semantics/omp-nested-barrier.f90

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