[clang][ExprConst] Check for array size of initlists

Fixes #138653

Author: tbaederr

clang/lib/AST/ExprConstant.cpp

@@ -11788,6 +11788,11 @@ bool ArrayExprEvaluator::VisitCXXParenListOrInitListExpr(
   LLVM_DEBUG(llvm::dbgs() << "The number of elements to initialize: "
                           << NumEltsToInit << ".\n");
 
+  if (!Info.CheckArraySize(ExprToVisit->getExprLoc(),
+                           CAT->getNumAddressingBits(Info.Ctx), NumEltsToInit,
+                           /*Diag=*/true))
+    return false;
+
   Result = APValue(APValue::UninitArray(), NumEltsToInit, NumElts);
 
   // If the array was previously zero-initialized, preserve the