[clang] Avoid printing overly large integer. (PR #75902)

[Nhat Nguyen via cfe-commits]

https://github.com/changkhothuychung created https://github.com/llvm/llvm-project/pull/75902

Created a PR to fix issue #71675

>From 0eb58740f33f2eef29c28e43e78118f9f0eea4b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9CNhat?= <“nhat7203 at gmail.com”>
Date: Tue, 19 Dec 2023 00:03:28 -0800
Subject: [PATCH] return false if the value is too large

---
 clang/lib/Sema/SemaDeclCXX.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index a3f68d4ffc0f6e..18631ec7dac152 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -17132,6 +17132,9 @@ static bool ConvertAPValueToString(const APValue &V, QualType T,
         case BuiltinType::WChar_U: {
           unsigned TyWidth = Context.getIntWidth(T);
           assert(8 <= TyWidth && TyWidth <= 32 && "Unexpected integer width");
+          if (V.getInt() >= (1 << 64)) {
+            return false;
+          }
           uint32_t CodeUnit = static_cast<uint32_t>(V.getInt().getZExtValue());
           WriteCharTypePrefix(BTy->getKind(), OS);
           OS << '\'';