[clang] [Clang] Don't assert on substituted-but-yet-expanded packs for nested lambdas (PR #112896)

[via cfe-commits]

================
@@ -8385,14 +8385,19 @@ TreeTransform<Derived>::TransformDeclStmt(DeclStmt *S) {
     if (Transformed != D)
       DeclChanged = true;
 
-    if (LSI && isa<TypeDecl>(Transformed))
-      LSI->ContainsUnexpandedParameterPack |=
-          getSema()
-              .getASTContext()
-              .getTypeDeclType(cast<TypeDecl>(Transformed))
-              .getCanonicalType()
-              .getTypePtr()
-              ->containsUnexpandedParameterPack();
+    if (LSI) {
+      if (auto *TD = dyn_cast<TypeDecl>(Transformed))
+        LSI->ContainsUnexpandedParameterPack |=
+            getSema()
+                .getASTContext()
+                .getTypeDeclType(TD)
+                .getCanonicalType()
+                ->containsUnexpandedParameterPack();
+
+      if (auto *VD = dyn_cast<VarDecl>(Transformed))
+        LSI->ContainsUnexpandedParameterPack |=
+            VD->getType()->containsUnexpandedParameterPack();
+    }
----------------
cor3ntin wrote:

Haha, this is mostly a "gosh, this is getting unwieldy, i wonder if there is a 
better way", rather than a request for a change. I was referring to this 
https://github.com/llvm/llvm-project/issues/9395#issuecomment-980892278  

https://github.com/llvm/llvm-project/pull/112896
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