[clang] [CIR] Implement builtin extractf (PR #170427)

[Henrich Lauko via cfe-commits]

================
@@ -425,6 +425,27 @@ def CIR_ConstantOp : CIR_Op<"const", [
         return boolAttr.getValue();
       llvm_unreachable("Expected a BoolAttr in ConstantOp");
     }
+    bool isAllOnesValue() {
----------------
xlauko wrote:

```suggestion
    }

    bool isAllOnesValue() {
```

https://github.com/llvm/llvm-project/pull/170427