Add missing file.

.gitignore

@@ -11,7 +11,7 @@
 *.userprefs
 
 # Build results
-[Dd]ebug/
+bin/[Dd]ebug/
 [Dd]ebugPublic/
 [Rr]elease/
 [Rr]eleases/

osu.Game/Overlays/Options/Sections/Debug/GCOptions.cs

@@ -0,0 +1,37 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Runtime;
+using osu.Framework.Allocation;
+using osu.Framework.Configuration;
+using osu.Framework.Graphics;
+using osu.Game.Configuration;
+using osu.Game.Graphics.UserInterface;
+
+namespace osu.Game.Overlays.Options.Sections.Debug
+{
+    public class GCOptions : OptionsSubsection
+    {
+        protected override string Header => "Garbage Collector";
+
+        [BackgroundDependencyLoader]
+        private void load(FrameworkDebugConfigManager config)
+        {
+            Children = new Drawable[]
+            {
+                new OptionEnumDropDown<GCLatencyMode>
+                {
+                    LabelText = "Active mode",
+                    Bindable = config.GetBindable<GCLatencyMode>(FrameworkDebugConfig.ActiveGCMode)
+                },
+                new OsuButton
+                {
+                    RelativeSizeAxes = Axes.X,
+                    Text = "Force garbage collection",
+                    Action = () => GC.Collect()
+                },
+            };
+        }
+    }
+}