Memory Changes part 2

* Slightly refactors RangeLists from the last Memory Changes MR, which fixes issue 61.

* Convert as many const size array iterators to span iterators as possible. When iterating over a const size array, every iteration created a Span, now only the first iteration does in most places.

* Now using object pooling for a few object types that were rapidly deleted and recreated.

* Converted a few flag checks to binary operations to save memory allocations.

src/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/Types/AddrInfo4.cs

@@ -30,21 +30,21 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Types
         {
             Port = IPAddress.HostToNetworkOrder(Port);
 
-            RawIpv4AddressNetworkEndianSwap(ref Address);
+            RawIpv4AddressNetworkEndianSwap(Address.AsSpan());
         }
 
         public void ToHostOrder()
         {
             Port = IPAddress.NetworkToHostOrder(Port);
 
-            RawIpv4AddressNetworkEndianSwap(ref Address);
+            RawIpv4AddressNetworkEndianSwap(Address.AsSpan());
         }
 
-        public static void RawIpv4AddressNetworkEndianSwap(ref Array4<byte> address)
+        public static void RawIpv4AddressNetworkEndianSwap(Span<byte> address)
         {
             if (BitConverter.IsLittleEndian)
             {
-                address.AsSpan().Reverse();
+                address.Reverse();
             }
         }
     }

src/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/Types/AddrInfoSerialized.cs

@@ -73,7 +73,7 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Types
             {
                 // Nintendo hardcode 4 bytes in that case here.
                 Array4<byte> address = MemoryMarshal.Read<Array4<byte>>(buffer);
-                AddrInfo4.RawIpv4AddressNetworkEndianSwap(ref address);
+                AddrInfo4.RawIpv4AddressNetworkEndianSwap(address.AsSpan());
 
                 rawIPv4Address = address;
 
@@ -115,7 +115,7 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Types
             else
             {
                 Array4<byte> rawIPv4Address = RawIPv4Address.Value;
-                AddrInfo4.RawIpv4AddressNetworkEndianSwap(ref rawIPv4Address);
+                AddrInfo4.RawIpv4AddressNetworkEndianSwap(rawIPv4Address.AsSpan());
 
                 MemoryMarshal.Write(buffer, in rawIPv4Address);