Basic infrastructure for binder tracing (dotnet/coreclr#27383)

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

src/Common/src/CoreLib/System/Diagnostics/Tracing/ActivityTracker.cs

@@ -588,6 +588,25 @@ private void ActivityChanging(AsyncLocalValueChangedArgs<ActivityInfo?> args)
             // currently we do nothing, as that seems better than setting to Guid.Emtpy.
         }
 
+        // Assembly load runtime activity name
+        private const string AssemblyLoadName = "AssemblyLoad";
+
+        /// <summary>
+        /// Called by the runtime to start an assembly load activity
+        /// </summary>
+        private static void StartAssemblyLoad(ref Guid activityId, ref Guid relatedActivityId)
+        {
+            Instance.OnStart(NativeRuntimeEventSource.Log.Name, AssemblyLoadName, 0, ref activityId, ref relatedActivityId, EventActivityOptions.Recursive);
+        }
+
+        /// <summary>
+        /// Called by the runtime to stop an assembly load activity
+        /// </summary>
+        private static void StopAssemblyLoad(ref Guid activityId)
+        {
+            Instance.OnStop(NativeRuntimeEventSource.Log.Name, AssemblyLoadName, 0, ref activityId);
+        }
+
         /// <summary>
         /// Async local variables have the property that the are automatically copied whenever a task is created and used
         /// while that task is running.   Thus m_current 'flows' to any task that is caused by the current thread that