Don't Sleep(1) in some spin-wait loops

src/System.Private.CoreLib/shared/System/Collections/Concurrent/ConcurrentQueueSegment.cs

@@ -193,7 +193,7 @@ public bool TryDequeue(out T item)
                 }
 
                 // Lost a race. Spin a bit, then try again.
-                spinner.SpinOnce();
+                spinner.SpinOnce(sleep1Threshold: -1);
             }
         }
 
@@ -254,7 +254,7 @@ public bool TryPeek(out T result, bool resultUsed)
                 }
 
                 // Lost a race. Spin a bit, then try again.
-                spinner.SpinOnce();
+                spinner.SpinOnce(sleep1Threshold: -1);
             }
         }
 
@@ -311,7 +311,7 @@ public bool TryEnqueue(T item)
                 }
 
                 // Lost a race. Spin a bit, then try again.
-                spinner.SpinOnce();
+                spinner.SpinOnce(sleep1Threshold: -1);
             }
         }
 

src/System.Private.CoreLib/shared/System/Threading/ManualResetEventSlim.cs

@@ -551,7 +551,7 @@ public bool Wait(int millisecondsTimeout, CancellationToken cancellationToken)
                 var spinner = new SpinWait();
                 while (spinner.Count < spinCount)
                 {
-                    spinner.SpinOnce(SpinWait.Sleep1ThresholdForLongSpinBeforeWait);
+                    spinner.SpinOnce(sleep1Threshold: -1);
 
                     if (IsSet)
                     {
@@ -720,7 +720,7 @@ private void UpdateStateAtomically(int newBits, int updateBitsMask)
                     return;
                 }
 
-                sw.SpinOnce();
+                sw.SpinOnce(sleep1Threshold: -1);
             } while (true);
         }
 

src/System.Private.CoreLib/shared/System/Threading/SpinWait.cs

@@ -89,16 +89,6 @@ public struct SpinWait
         /// </remarks>
         internal static readonly int SpinCountforSpinBeforeWait = PlatformHelper.IsSingleProcessor ? 1 : 35;
 
-        /// <summary>
-        /// Typically, Sleep(1) should not be issued for a spin-wait before a proper wait because it is usually more beneficial
-        /// to just issue the proper wait. For longer spin-waits (when the spin count is configurable), this value may be used as
-        /// a threshold for issuing Sleep(1).
-        /// </summary>
-        /// <remarks>
-        /// Should be greater than <see cref="SpinCountforSpinBeforeWait"/> so that Sleep(1) would not be used by default.
-        /// </remarks>
-        internal const int Sleep1ThresholdForLongSpinBeforeWait = 40;
-
         // The number of times we've spun already.
         private int _count;