Remove ExperimentalAttribute from async helpers

Author: VSadov

src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.cs

@@ -11,7 +11,6 @@
 namespace System.Runtime.CompilerServices
 {
     [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
-    [System.Diagnostics.CodeAnalysis.ExperimentalAttribute("SYSLIB5007", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
     public static partial class AsyncHelpers
     {
 #if CORECLR

src/libraries/System.Runtime/ref/System.Runtime.cs

@@ -14138,7 +14138,6 @@ public static void RunModuleConstructor(System.ModuleHandle module) { }
         public delegate void TryCode(object? userData);
     }
     [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
-    [System.Diagnostics.CodeAnalysis.ExperimentalAttribute("SYSLIB5007", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
     public static partial class AsyncHelpers
     {
         [System.Runtime.Versioning.RequiresPreviewFeaturesAttribute]

src/tests/async/fibonacci-without-yields-config-await/fibonacci-without-yields-config-await.cs

@@ -7,8 +7,6 @@
 using System.Runtime.CompilerServices;
 using Xunit;
 
-#pragma warning disable SYSLIB5007 // 'System.Runtime.CompilerServices.AsyncHelpers' is for evaluation purposes only
-
 public class Async2FibonacciWithYields
 {
     const int iterations = 3;

src/tests/async/reflection/reflection-simple.cs

@@ -22,7 +22,6 @@ public static void MethodInfo_Invoke_TaskReturning()
         Assert.Equal(100, (int)(r.Result + d.Bar().Result));
     }
 
-#pragma warning disable SYSLIB5007 // 'System.Runtime.CompilerServices.AsyncHelpers' is for evaluation purposes only
     [Fact]
     public static void MethodInfo_Invoke_AsyncHelper()
     {
@@ -37,7 +36,6 @@ public static void MethodInfo_Invoke_AsyncHelper()
         // dynamic d = FooTask();
         // System.Runtime.CompilerServices.AsyncHelpers.Await(d);
     }
-#pragma warning restore SYSLIB5007
 
     private static async Task<int> Foo()
     {
@@ -164,9 +162,7 @@ public static void TypeBuilder_DefineMethod()
         // }
         ILGenerator ilGenerator = methodBuilder.GetILGenerator();
         ilGenerator.Emit(OpCodes.Ldarg_0);
-#pragma warning disable SYSLIB5007 // 'System.Runtime.CompilerServices.AsyncHelpers' is for evaluation purposes only
         var mi = typeof(System.Runtime.CompilerServices.AsyncHelpers).GetMethod("Await", BindingFlags.Static | BindingFlags.Public, new Type[] { typeof(Task) })!;
-#pragma warning restore SYSLIB5007
         ilGenerator.EmitCall(OpCodes.Call, mi, new Type[] { typeof(Task) });
         ilGenerator.Emit(OpCodes.Ret);