[clang] [clang] Implement `__is_pointer_interconvertible_base_of()` (PR #88473)

[Vlad Serebrennikov via cfe-commits]

================
@@ -6082,6 +6082,22 @@ static bool EvaluateBinaryTypeTrait(Sema &Self, 
TypeTrait BTT, const TypeSourceI
       Self.Diag(Rhs->getTypeLoc().getBeginLoc(), diag::err_vla_unsupported)
           << 1 << tok::kw___is_layout_compatible;
     return Self.IsLayoutCompatible(LhsT, RhsT);
+  }
+  case BTT_IsPointerInterconvertibleBaseOf: {
+    if (!LhsT->isUnionType() && !RhsT->isUnionType() &&
+        !Self.getASTContext().hasSameUnqualifiedType(LhsT, RhsT)) {
+      Self.RequireCompleteType(Rhs->getTypeLoc().getBeginLoc(), RhsT,
+                               diag::err_incomplete_type);
----------------
Endilll wrote:

Done!

https://github.com/llvm/llvm-project/pull/88473
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