[clang] [Clang] Fix default initializer crash (PR #230520)

[Yihan Wang via cfe-commits]

================
@@ -15295,19 +15295,20 @@ 
TreeTransform<Derived>::TransformCXXDefaultInitExpr(CXXDefaultInitExpr *E) {
   if (!Field)
     return ExprError();
 
+  Expr *RewrittenInit = E->hasRewrittenInit() ? E->getRewrittenExpr() : 
nullptr;
   ExprResult InitRes;
-  if (E->hasRewrittenInit()) {
+  if (RewrittenInit) {
----------------
yronglin wrote:

```suggestion
  if (E->hasRewrittenInit()) {
```

https://github.com/llvm/llvm-project/pull/230520
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