[clang] [APINotes] Upstream Sema logic to apply API Notes to decls (PR #73017)

[Egor Zhdan via cfe-commits]

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@@ -7519,6 +7519,26 @@ static bool HandleWebAssemblyFuncrefAttr(TypeProcessingState &State,
   return false;
 }
 
+/// Rebuild an attributed type without the nullability attribute on it.
+static QualType rebuildAttributedTypeWithoutNullability(ASTContext &Ctx,
+                                                        QualType Type) {
+  auto Attributed = dyn_cast<AttributedType>(Type.getTypePtr());
+  if (!Attributed)
+    return Type;
+
+  // Skip the nullability attribute; we're done.
+  if (Attributed->getImmediateNullability()) {
+    return Attributed->getModifiedType();
+  }
+
+  // Build the modified type.
+  auto Modified = rebuildAttributedTypeWithoutNullability(
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egorzhdan wrote:

This is a `QualType`, added the explicit type.

https://github.com/llvm/llvm-project/pull/73017