Fix up roslyn reference to newest

Author: agocke

src/tests/Directory.Build.props

@@ -10,7 +10,7 @@
 
   <PropertyGroup>
     <!-- Override the compiler version with a private build that supports async2 -->
-    <MicrosoftNetCompilersToolsetVersion>5.0.0-1.25222.4</MicrosoftNetCompilersToolsetVersion>
+    <MicrosoftNetCompilersToolsetVersion>5.0.0-1.25259.6</MicrosoftNetCompilersToolsetVersion>
   </PropertyGroup>
 
   <PropertyGroup>

src/tests/async/Directory.Build.targets

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <!-- runtime async testing in main repo NYI -->
-    <DisableProjectBuild>true</DisableProjectBuild>
+    <!-- <DisableProjectBuild>true</DisableProjectBuild> -->
   </PropertyGroup>
 
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />

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

@@ -26,7 +26,7 @@ public static void Test()
         System.Console.WriteLine("allocated: " + allocated);
     }
 
-    public static async2 Task AsyncEntry()
+    public static async Task AsyncEntry()
     {
         for (int i = 0; i < iterations; i++)
         {
@@ -38,7 +38,7 @@ public static async2 Task AsyncEntry()
         }
     }
 
-    static async2 Task<int> Fib(int i)
+    static async Task<int> Fib(int i)
     {
         if (i <= 1)
         {

src/tests/async/small/small.cs

@@ -15,7 +15,7 @@ public static void TestEntryPoint()
     }
 
     [MethodImpl(MethodImplOptions.NoInlining)]
-    private static async2 Task SmallType(byte arg)
+    private static async Task SmallType(byte arg)
     {
         await Task.Yield();
         Assert.Equal(123, arg);

src/tests/async/struct/struct.cs

@@ -17,13 +17,21 @@ public static void TestEntryPoint()
         Async2().Wait();
     }
 
+    [RuntimeAsyncMethodGeneration(false)]
     private static async Task Async()
     {
         S s = new S(100);
         await s.Test();
         AssertEqual(100, s.Value);
     }
 
+    private static async Task Async2()
+    {
+        S s = new S(100);
+        await s.Test();
+        AssertEqual(100, s.Value);
+    }
+
     [MethodImpl(MethodImplOptions.NoInlining)]
     private static void AssertEqual(int expected, int val)
     {