Simplify lazy initialization by removing Volatile.Read (#117868)

Replaced `Volatile.Read` with plain field reads. The memory barriers provided by `CompareExchange` are
sufficient to ensure thread safety and visibility, making `Volatile.Read`
unnecessary.

Follow-up to #117817

Related: #100969

cc: @stephentoub

Co-authored-by: Tanner Gooding <[email protected]>

Author: xtqqczze

src/libraries/System.Diagnostics.TraceSource/src/System/Diagnostics/Trace.cs

@@ -20,9 +20,7 @@ private Trace()
         }
 
         public static CorrelationManager CorrelationManager =>
-            Volatile.Read(ref field) ??
-            Interlocked.CompareExchange(ref field, new(), null) ??
-            field;
+            field ?? Interlocked.CompareExchange(ref field, new(), null) ?? field;
 
         /// <devdoc>
         ///    <para>Gets the collection of listeners that is monitoring the trace output.</para>

src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs

@@ -472,9 +472,7 @@ internal TResult GetResultCore(bool waitCompletionNotification)
         /// the default constructor on the factory type.
         /// </remarks>
         public static new TaskFactory<TResult> Factory =>
-            Volatile.Read(ref field) ??
-            Interlocked.CompareExchange(ref field, new(), null) ??
-            field;
+            field ?? Interlocked.CompareExchange(ref field, new(), null) ?? field;
 
         /// <summary>
         /// Evaluates the value selector of the Task which is passed in as an object and stores the result.