Change equality comparison on RegisterMask for consistency

Co-Authored-By: gdkchan <gab.dark.100@gmail.com>

ChocolArm64/IntermediateRepresentation/RegisterMask.cs

@@ -35,7 +35,7 @@ namespace ChocolArm64.IntermediateRepresentation
 
         public static bool operator !=(RegisterMask x, RegisterMask y)
         {
-            return !(x == y);
+            return !x.Equals(y);
         }
 
         public override bool Equals(object obj)
@@ -53,4 +53,4 @@ namespace ChocolArm64.IntermediateRepresentation
             return IntMask == other.IntMask && VecMask == other.VecMask;
         }
     }
-}
+}