---

This section details on the original issue you should resolve

<issue_title>Update async Main code generation</issue_title>
<issue_description>dotnet/runtime#121046 proposes a new api for async Main methods to allow WASM to understand the entry point correctly. If approved, we will want to react and update the codegen for our stub entrypoint methods in the case the user uses async Main:

static async void Main() { }

// Generated stub will now be:
static void <Main>(string[] args) => AsyncHelpers.ExecuteAsyncEntryPoint(Main(args));
```</issue_description>

<agent_instructions>The runtime finalized the API names as:
```cs
namespace System.Runtime.CompilerServices;

[EditorBrowsable(EditorBrowsableState.Never)]
public static partial class AsyncHelpers
{
    public static void HandleAsyncEntryPoint(Task task);
    public static int HandleAsyncEntryPoint(Task<int> task);
}

Implement this change by adding the apis to SpecialMember, and updating the code generation for the async entrypoint code to call those APIs if, and only if, they exist at runtime. In order to write a unit test for this, you will need to define a minimal corelib as a string and add these APIs to it.</agent_instructions>

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