[clang] [CIR] Add poison attribute (PR #150760)

[Henrich Lauko via cfe-commits]

================
@@ -2239,16 +2249,18 @@ static OpFoldResult
 foldUnaryBitOp(mlir::Attribute inputAttr,
                llvm::function_ref<llvm::APInt(const llvm::APInt &)> func,
                bool poisonZero = false) {
+  if (mlir::isa_and_present<PoisonAttr>(inputAttr)) {
----------------
xlauko wrote:

```suggestion
  if (mlir::isa_and_present<cir::PoisonAttr>(inputAttr)) {
```

https://github.com/llvm/llvm-project/pull/150760
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