feature: .NET 10 (ryubing/ryujinx!214)

See merge request ryubing/ryujinx!214

src/ARMeilleure/Instructions/SoftFallback/SoftFallback.cs

@@ -0,0 +1,26 @@
+using ARMeilleure.State;
+using System.Runtime.InteropServices;
+
+namespace ARMeilleure.Instructions
+{
+    static partial class SoftFallback
+    {
+        [UnmanagedCallersOnly]
+        public static V128 PolynomialMult64_128(ulong op1, ulong op2)
+        {
+            V128 result = V128.Zero;
+
+            V128 op2_128 = new(op2, 0);
+
+            for (int i = 0; i < 64; i++)
+            {
+                if (((op1 >> i) & 1) == 1)
+                {
+                    result ^= op2_128 << i;
+                }
+            }
+
+            return result;
+        }
+    }
+}