[K/JS] Prevent Char boxing on value or reference equals call

js/js.translator/testData/box/char/charEquals.kt

@@ -1,15 +1,21 @@
 // EXPECTED_REACHABLE_NODES: 1372
 package foo
 
+// CHECK_NEW_COUNT: function=box max=6
 fun box(): String {
-
     assertEquals(true, 'A' == 'A')
+    assertEquals(false, 'A' != 'A')
     assertEquals(false, 'A' == 'B')
+    assertEquals(true, 'A' != 'B')
     assertEquals(false, ('A' as Any) == (65 as Any))
+    assertEquals(true, ('A' as Any) != (65 as Any))
 
     assertEquals(true, 'A' === 'A')
+    assertEquals(false, 'A' !== 'A')
     assertEquals(false, 'A' === 'B')
+    assertEquals(true, 'A' !== 'B')
     assertEquals(false, ('A' as Any) === (65 as Any))
+    assertEquals(true, ('A' as Any) !== (65 as Any))
 
     assertTrue(bar('Q'))
     assertFalse(bar('W'))