[clang] [clang] fix sema init crash for not checking a ExprResult (PR #98102)

[Yuxuan Chen via cfe-commits]

================
@@ -5576,6 +5576,10 @@ static void TryOrBuildParenListInitialization(
       ExprResult ER;
       ER = IS.Perform(S, SubEntity, SubKind,
                       Arg ? MultiExprArg(Arg) : std::nullopt);
+
+      if (ER.IsInvalid())
+        return false;
+
       if (InitExpr)
         *InitExpr = ER.get();
----------------
yuxuanchen1997 wrote:

ER.get() is null if we don't apply this fix. 

https://github.com/llvm/llvm-project/pull/98102
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