[clang] [Clang][P1061] Add stuctured binding packs (PR #121417)

[via cfe-commits]

================
@@ -2484,6 +2489,16 @@ TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr 
*E) {
     if (PD->isParameterPack())
       return TransformFunctionParmPackRefExpr(E, PD);
 
+  if (BindingDecl *BD = dyn_cast<BindingDecl>(D); BD && BD->isParameterPack()) 
{
+    BD = cast_or_null<BindingDecl>(TransformDecl(BD->getLocation(), BD));
+    if (!BD)
+      return ExprError();
+    if (auto *RP =
+            dyn_cast_if_present<ResolvedUnexpandedPackExpr>(BD->getBinding())) 
{
+      return TransformResolvedUnexpandedPackExpr(RP);
+    }
+  }
+
----------------
cor3ntin wrote:

```suggestion
    if (auto *RP =
            dyn_cast_if_present<ResolvedUnexpandedPackExpr>(BD->getBinding()))
      return TransformResolvedUnexpandedPackExpr(RP);
  }

```

https://github.com/llvm/llvm-project/pull/121417
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