[swfinterp] Implement equals opcode

test/swftests/EqualsOperator.as

@@ -0,0 +1,10 @@
+// input: []
+// output: false
+
+package {
+public class EqualsOperator {
+    public static function main():Boolean{
+        return 1 == 2;
+    }
+}
+}