Reverted change in EventSource, put suppression in ifdef

src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs

@@ -3606,6 +3606,13 @@ private static void DebugCheckEvent(ref Dictionary<string, string>? eventsByName
         /// </summary>
         /// <param name="method">The method to probe.</param>
         /// <returns>The literal value or -1 if the value could not be determined. </returns>
+#if !NATIVEAOT
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
+                    Justification = "The method calls MethodBase.GetMethodBody. Trimming application can change IL of various methods" +
+                                    "which can lead to change of behavior. This method only uses this to validate usage of event source APIs." +
+                                    "In the worst case it will not be able to determine the value it's looking for and will not perform" +
+                                    "any validation.")]
+#endif
         private static int GetHelperCallFirstArg(MethodInfo method)
         {
 #if !NATIVEAOT
@@ -3620,7 +3627,7 @@ private static int GetHelperCallFirstArg(MethodInfo method)
             // RET
             //
             // If we find this pattern we return the XXX.  Otherwise we return -1.
-            byte[] instrs = GetMethodBodyLocal(method)!.GetILAsByteArray()!;
+            byte[] instrs = method.GetMethodBody()!.GetILAsByteArray()!;
             int retVal = -1;
             for (int idx = 0; idx < instrs.Length;)
             {
@@ -3722,16 +3729,6 @@ private static int GetHelperCallFirstArg(MethodInfo method)
                 }
                 idx++;
             }
-
-            [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
-                        Justification = "The method calls MethodBase.GetMethodBody. Trimming application can change IL of various methods" +
-                                        "which can lead to change of behavior. This method only uses this to validate usage of event source APIs." +
-                                        "In the worst case it will not be able to determine the value it's looking for and will not perform" +
-                                        "any validation.")]
-            static MethodBody? GetMethodBodyLocal(MethodInfo method)
-            {
-                return method.GetMethodBody();
-            }
 #endif
             return -1;
         }