[clang] [clang] Change placeholder from `undef` to `poison` (PR #131533)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-codegen

Author: Pedro Lobo (pedroclobo)

<details>
<summary>Changes</summary>

Return a `poison` value, instead of `undef`, if there is no available SEH info.

---
Full diff: https://github.com/llvm/llvm-project/pull/131533.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGException.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 5a395c924333e..b4b8c2952b02b 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -2145,7 +2145,7 @@ llvm::Value *CodeGenFunction::EmitSEHExceptionInfo() {
   // Sema should diagnose calling this builtin outside of a filter context, but
   // don't crash if we screw up.
   if (!SEHInfo)
-    return llvm::UndefValue::get(Int8PtrTy);
+    return llvm::PoisonValue::get(Int8PtrTy);
   assert(SEHInfo->getType() == Int8PtrTy);
   return SEHInfo;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/131533