Revert "[JS IR] [runtime] Remove valueOf method from Long"

This reverts commit e13b6b2a90.

The significance of the breakage caused by the removal of `valueOf`
was underestimated.

#KT-50202 Open

js/js.translator/testData/box/builtins/arrayToString.kt

@@ -27,7 +27,7 @@ fun testKt14013() {
     if (testUtils.isLegacyBackend()) {
         assertEquals(",1;[...];,1;", pullLog(), "testKt14013")
     } else {
-        assertEquals(",1;[...];[...];", pullLog(), "testKt14013")
+        assertEquals("[...];[...];[...];", pullLog(), "testKt14013")
     }
 }
 
@@ -74,7 +74,7 @@ fun box(): String {
     if (testUtils.isLegacyBackend()) {
         assertEquals("1,2,3;1,2,3;[...];", pullLog(), "anyValueToString")
     } else {
-        assertEquals("[...];1,2,3;1,2,3;", pullLog(), "anyValueToString")
+        assertEquals("[...];[...];[...];", pullLog(), "anyValueToString")
     }
 
     return "OK"