JS: Remove intrinsic for Long.equals, because it's applied incorrectly for nullable longs.

#KT-7500 Fixed

js/js.translator/testData/number/cases/longEqualsIntrinsic.kt

@@ -1,7 +1,6 @@
 package foo
 
 fun box(): String {
-
     assertEquals(true, 10L == 10L, "Long == Long")
     assertEquals(true, 10L != 11L, "Long != Long")
 
@@ -10,9 +9,18 @@ fun box(): String {
     assertEquals(false, x1 == null, "Long? == null")
     assertEquals(false, null == x1, "null == Long?")
     assertEquals(true, x1 == 10L, "Long? == Long")
-    assertEquals(true, 10L == x1, "Long? == Long")
+    assertEquals(true, 10L == x1, "Long == Long?")
     assertEquals(true, x1 == x2, "Long? == Long?")
 
+    val x3: Long? = null
+    val x4: Long? = null
+    assertEquals(true, x3 == null, "Long?(null) == null")
+    assertEquals(true, null == x3, "null == Long?(null)")
+    assertEquals(false, x3 == 10L, "Long?(null) == Long")
+    assertEquals(false, 10L == x3, "Long == Long?(null)")
+    assertEquals(false, x3 == x1, "Long?(null) == Long?")
+    assertEquals(true, x3 == x4, "Long?(null) == Long?(null)")
+
     val number1: Number = 10L
     val number2: Number = 10L
     assertEquals(true, number1 == number2, "Number == Number")
@@ -23,9 +31,12 @@ fun box(): String {
 
     val y1: Any = 10L
     var y2: Any = 10
+    var y3: Any? = null
     assertEquals(true, y1 == 10L, "Any == Long")
     assertEquals(true, 10L == y1, "Long == Any 1")
     assertEquals(false, 10L == y2, "Long == Any 2")
+    assertEquals(false, 10L == y3, "Long == Any?(null)")
+    assertEquals(true, x3 == y3, "Long?(null) == Any?(null)")
 
     return "OK"
 }