[flang] [llvm] [Flang][OpenMP] Fix crash on invalid atomic variable expressions (PR #173068)

[Krish Gupta via llvm-commits]

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@@ -587,7 +587,24 @@ void OmpStructureChecker::CheckAtomicVariable(
   }
 
   std::vector<SomeExpr> dsgs{GetAllDesignators(atom)};
-  assert(dsgs.size() == 1 && "Should have a single top-level designator");
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KrxGu wrote:

make sense!!

https://github.com/llvm/llvm-project/pull/173068