[clang] [C23] Implement WG14 N3037 (PR #132939)

[Aaron Ballman via cfe-commits]

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@@ -1496,9 +1615,37 @@ static bool IsStructurallyEquivalent(StructuralEquivalenceContext &Context,
     return false;
   }
 
-  if (Field1->isBitField())
-    return IsStructurallyEquivalent(Context, Field1->getBitWidth(),
-                                    Field2->getBitWidth());
+  if ((Field1->isBitField() || Field2->isBitField()) &&
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AaronBallman wrote:

Yes, it was a previous bug and I am testing it in the n3037.c test by testing in both orders.

https://github.com/llvm/llvm-project/pull/132939