Remove reflection code

See #5, #10

UnityAsync/Assets/UnityAsync/AwaitInstructionAwaiter.cs

@@ -47,7 +47,7 @@ public bool Evaluate()
 				// if owner is destroyed, behaves like a UnityEngine.Coroutine, ie:
 				// "With this object's death, the thread of prophecy is severed. Restore a saved game to restore the
 				// weave of fate, or persist in the doomed world you have created."
-				if(!owner.IsAlive())
+				if(!owner)
 					return true;
 
 				// if not completed, return false to put it back into a queue for next frame

UnityAsync/Assets/UnityAsync/Extensions.cs

@@ -11,22 +11,6 @@ namespace UnityAsync
 {
 	public static class Extensions
 	{
-		#if !ENABLE_IL2CPP
-
-		static readonly Func<Object, IntPtr> ObjectPtrGetter;
-
-		static Extensions() => ReflectionUtility.GenerateFieldGetter("m_CachedPtr", out ObjectPtrGetter);
-
-		[MethodImpl(MethodImplOptions.AggressiveInlining)]
-		internal static bool IsAlive(this Object o) => ObjectPtrGetter(o) != IntPtr.Zero;
-
-		#else
-
-		[MethodImpl(MethodImplOptions.AggressiveInlining)]
-		internal static bool IsAlive(this Object o) => o != null;
-
-		#endif
-
 		/// <summary>
 		/// Link the <see cref="UnityAsync.IAwaitInstruction"/>'s lifespan to a <see cref="UnityEngine.Object"/> and
 		/// configure the type of update cycle it should be evaluated on.