[clang] [coroutines] Introduce [[clang::coro_lifetimebound]] (PR #72851)

[Ilya Biryukov via cfe-commits]

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@@ -334,6 +334,10 @@ Attribute Changes in Clang
         [[clang::code_align(A)]] for(;;) { }
       }
 
+- Clang now introduced ``[[clang::coro_lifetimebound]]`` attribute.
+  All arguments to a function are considered to be lifetime bound if the function
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ilya-biryukov wrote:

```suggestion
  All parameters to a function are considered to be lifetime bound if the function
```
Since the original attribute is applied to parameters, I believe this would be more accurate.
I also suggest adding something like:
```
See documentation of ``[[clang::lifetimebound]]`` for more details.
```

https://github.com/llvm/llvm-project/pull/72851