[clang] [Clang] Fix constexpr-ness on implicitly deleted destructors (PR #116359)

[via cfe-commits]

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@@ -1213,8 +1213,13 @@ void CXXRecordDecl::addedMember(Decl *D) {
             data().DefaultedCopyAssignmentIsDeleted = true;
           if (FieldRec->hasNonTrivialMoveAssignment())
             data().DefaultedMoveAssignmentIsDeleted = true;
-          if (FieldRec->hasNonTrivialDestructor())
+          if (FieldRec->hasNonTrivialDestructor()) {
             data().DefaultedDestructorIsDeleted = true;
+            // C++20 [dcl.constexpr]p5:
+            //   The definition of a constexpr destructor whose function-body is
+            //   [not = delete] shall additionally satisfy...
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cor3ntin wrote:

```suggestion
            //   not = delete shall additionally satisfy...
```

https://github.com/llvm/llvm-project/pull/116359