Ryujinx.Tests: Add unicorn to test framework (#389)

* Ryujinx.Tests: Add unicorn to test framework

* CpuTestSimdArithmetic: Comment out inaccurate results

Ryujinx.Tests.Unicorn/UnicornException.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Tests.Unicorn
+{
+    public class UnicornException : Exception
+    {
+        public readonly UnicornError Error;
+
+        internal UnicornException(UnicornError error)
+        {
+            Error = error;
+        }
+
+        public override string Message
+        {
+            get
+            {
+                return Marshal.PtrToStringAnsi(Native.Interface.uc_strerror(Error));
+            }
+        }
+    }
+}