Remove now unnecessary !s / TODO-NULLABLE comments (#25749)

* Remove !s and TODO-NULLABLE comments for [DoesNotReturn]

* Remove !s and TODO-NULLABLE comments for [NotNullIfNotNull]

* Remove !s and TODO-NULLABLE comments for writes via Interlocked.CompareExchange

* Remove !s and TODO-NULLABLE comments for Debug.Assert on fields

* Update/add several TODO-NULLABLE comments

1 files changed, 4 insertions, 4 deletions

diff --git a/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCompletionSource.cs b/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCompletionSource.cs
index b0c79e61ba..71a7e22ebd 100644
--- a/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCompletionSource.cs
+++ b/src/System.Private.CoreLib/shared/System/Threading/Tasks/TaskCompletionSource.cs
@@ -150,7 +150,7 @@ namespace System.Threading.Tasks
         {
             if (exception == null) ThrowHelper.ThrowArgumentNullException(ExceptionArgument.exception);
 
-            bool rval = _task.TrySetException(exception!); // TODO-NULLABLE: Remove ! when [DoesNotReturn] respected
+            bool rval = _task.TrySetException(exception);
             if (!rval && !_task.IsCompleted) SpinUntilCompleted();
             return rval;
         }
@@ -180,11 +180,11 @@ namespace System.Threading.Tasks
             if (exceptions == null) ThrowHelper.ThrowArgumentNullException(ExceptionArgument.exceptions);
 
             List<Exception> defensiveCopy = new List<Exception>();
-            foreach (Exception e in exceptions!) // TODO-NULLABLE: Remove ! when [DoesNotReturn] respected
+            foreach (Exception e in exceptions)
             {
                 if (e == null)
                     ThrowHelper.ThrowArgumentException(ExceptionResource.TaskCompletionSourceT_TrySetException_NullException, ExceptionArgument.exceptions);
-                defensiveCopy.Add(e!); // TODO-NULLABLE: Remove ! when [DoesNotReturn] respected
+                defensiveCopy.Add(e);
             }
 
             if (defensiveCopy.Count == 0)
@@ -216,7 +216,7 @@ namespace System.Threading.Tasks
         {
             if (exception == null) ThrowHelper.ThrowArgumentNullException(ExceptionArgument.exception);
 
-            if (!TrySetException(exception!)) // TODO-NULLABLE: Remove ! when [DoesNotReturn] respected
+            if (!TrySetException(exception))
             {
                 ThrowHelper.ThrowInvalidOperationException(ExceptionResource.TaskT_TransitionToFinal_AlreadyCompleted);
             }