Always use TaskCreationOptions.RunContinuationsAsynchronously (#1966)

Author: JamesNK

src/Microsoft.AspNetCore.Http.Connections/HttpConnectionContext.cs

@@ -34,7 +34,7 @@ public class HttpConnectionContext : ConnectionContext,
 
         // This tcs exists so that multiple calls to DisposeAsync all wait asynchronously
         // on the same task
-        private readonly TaskCompletionSource<object> _disposeTcs = new TaskCompletionSource<object>();
+        private readonly TaskCompletionSource<object> _disposeTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
 
         /// <summary>
         /// Creates the DefaultConnectionContext without Pipes to avoid upfront allocations.

src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs

@@ -29,7 +29,7 @@ public class HubConnectionContext
         private readonly ConnectionContext _connectionContext;
         private readonly ILogger _logger;
         private readonly CancellationTokenSource _connectionAbortedTokenSource = new CancellationTokenSource();
-        private readonly TaskCompletionSource<object> _abortCompletedTcs = new TaskCompletionSource<object>();
+        private readonly TaskCompletionSource<object> _abortCompletedTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
         private readonly long _keepAliveDuration;
         private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1);