[clang] [CIR] Upstream minimal builtin function call support (PR #142981)

[Erich Keane via cfe-commits]

================
@@ -1858,6 +1858,40 @@ def FuncOp : CIR_Op<"func", [
   let hasVerifier = 1;
 }
 
+//===----------------------------------------------------------------------===//
+// LLVMIntrinsicCallOp
+//===----------------------------------------------------------------------===//
+
+def LLVMIntrinsicCallOp : CIR_Op<"llvm.intrinsic"> {
+  let summary = "Call to llvm intrinsic functions that is not defined in CIR";
----------------
erichkeane wrote:

```suggestion
  let summary = "Call to llvm intrinsic functions that are not defined in CIR";
```

https://github.com/llvm/llvm-project/pull/142981