[clang] [clang] Add builtins for `add` with `nuw` and/or `nsw` (PR #130354)

[via cfe-commits]

================
@@ -5037,6 +5037,66 @@ def ArithmeticFence : LangBuiltin<"ALL_LANGUAGES"> {
   let Prototype = "void(...)";
 }
 
+class SNUWTemplate :
----------------
macurtis-amd wrote:

I didn't see any infrastructure to handle the varying return type. How would I express that the return type is the same as the first argument type?

https://github.com/llvm/llvm-project/pull/130354