[llvm] [LLVM][ADT] Make `scope-exit` CTAD-capable (PR #173131)

[Victor Chernyakin via llvm-commits]

https://github.com/localspook created https://github.com/llvm/llvm-project/pull/173131

This enables using it like

```cpp
llvm::scope_exit Cleanup = [] { ... };
```
instead of
```cpp
auto Cleanup = llvm::make_scope_exit([] { ... });
```

>From 28d2310a4fd7f8aeed414934a819b4676a76cd9e Mon Sep 17 00:00:00 2001
From: Victor Chernyakin <chernyakin.victor.j at outlook.com>
Date: Fri, 19 Dec 2025 18:20:52 -0800
Subject: [PATCH] [LLVM][ADT] Make `scope-exit` CTAD-capable

---
 llvm/include/llvm/ADT/ScopeExit.h | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/llvm/include/llvm/ADT/ScopeExit.h b/llvm/include/llvm/ADT/ScopeExit.h
index 2f13fb65d34d8..04b602a69f7e3 100644
--- a/llvm/include/llvm/ADT/ScopeExit.h
+++ b/llvm/include/llvm/ADT/ScopeExit.h
@@ -15,13 +15,9 @@
 #ifndef LLVM_ADT_SCOPEEXIT_H
 #define LLVM_ADT_SCOPEEXIT_H
 
-#include "llvm/Support/Compiler.h"
-
-#include <type_traits>
 #include <utility>
 
 namespace llvm {
-namespace detail {
 
 template <typename Callable> class scope_exit {
   Callable ExitFunction;
@@ -47,17 +43,15 @@ template <typename Callable> class scope_exit {
   }
 };
 
-} // end namespace detail
+template <typename Callable> scope_exit(Callable) -> scope_exit<Callable>;
 
 // Keeps the callable object that is passed in, and execute it at the
 // destruction of the returned object (usually at the scope exit where the
 // returned object is kept).
 //
 // Interface is specified by p0052r2.
-template <typename Callable>
-[[nodiscard]] detail::scope_exit<std::decay_t<Callable>>
-make_scope_exit(Callable &&F) {
-  return detail::scope_exit<std::decay_t<Callable>>(std::forward<Callable>(F));
+template <typename Callable> [[nodiscard]] auto make_scope_exit(Callable &&F) {
+  return scope_exit(std::forward<Callable>(F));
 }
 
 } // end namespace llvm