[clang] [CIR] Upstream overflow builtins (PR #166643)

[Andy Kaylor via cfe-commits]

================
@@ -0,0 +1,364 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck %s --check-prefix=CIR --input-file=%t.cir
----------------
andykaylor wrote:

```suggestion
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
// RUN: FileCheck %s --check-prefix=CIR --input-file=%t.cir
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o %t-cir.ll
// RUN: FileCheck %s --check-prefix=LLVM --input-file=%t-cir.ll
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o %t.ll
// RUN: FileCheck %s --check-prefix=OGCG --input-file=%t.ll
```
Can you add LLVM and OGCG checks based on the above run lines?

https://github.com/llvm/llvm-project/pull/166643