GPU: Don't trigger uploads for redundant buffer updates (#3828)

* Initial implementation

* Actually do The Thing

* Add remark about performance to IVirtualMemoryManager

Ryujinx.Cpu/Jit/MemoryManagerHostMapped.cs

@@ -307,6 +307,34 @@ namespace Ryujinx.Cpu.Jit
             }
         }
 
+        /// <inheritdoc/>
+        public bool WriteWithRedundancyCheck(ulong va, ReadOnlySpan<byte> data)
+        {
+            try
+            {
+                SignalMemoryTracking(va, (ulong)data.Length, false);
+
+                Span<byte> target = _addressSpaceMirror.GetSpan(va, data.Length);
+                bool changed = !data.SequenceEqual(target);
+
+                if (changed)
+                {
+                    data.CopyTo(target);
+                }
+
+                return changed;
+            }
+            catch (InvalidMemoryRegionException)
+            {
+                if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
+                {
+                    throw;
+                }
+
+                return true;
+            }
+        }
+
         /// <inheritdoc/>
         public ReadOnlySpan<byte> GetSpan(ulong va, int size, bool tracked = false)
         {