[clang] [Clang] Preserve CXXParenListInitExpr in TreeTransform. (PR #138518)

[Younan Zhang via cfe-commits]

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@@ -16487,12 +16501,22 @@ ExprResult
 TreeTransform<Derived>::TransformCXXParenListInitExpr(CXXParenListInitExpr *E) {
   SmallVector<Expr *, 4> TransformedInits;
   ArrayRef<Expr *> InitExprs = E->getInitExprs();
-  if (TransformExprs(InitExprs.data(), InitExprs.size(), true,
-                     TransformedInits))
+
+  QualType T = getDerived().TransformType(E->getType());
+
+  bool ArgChanged = false;
+  ;
+
+  if (getDerived().TransformExprs(InitExprs.data(), InitExprs.size(), true,
+                                  TransformedInits, &ArgChanged))
     return ExprError();
 
-  return getDerived().RebuildParenListExpr(E->getBeginLoc(), TransformedInits,
-                                           E->getEndLoc());
+  if (!ArgChanged && T == E->getType())
+    return E;
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zyn0217 wrote:

Do we want to handle AlwaysRebuild?

https://github.com/llvm/llvm-project/pull/138518