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

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nhat Nguyen  (changkhothuychung)

<details>
<summary>Changes</summary>

Created a PR to fix issue #<!-- -->71675

---
Full diff: https://github.com/llvm/llvm-project/pull/75902.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaDeclCXX.cpp (+3) 


``````````diff
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 << '\'';

``````````

</details>


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