[JS IR BE] hashCode, toString, number conversion support

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

@@ -0,0 +1,32 @@
+// EXPECTED_REACHABLE_NODES: 1117
+package foo
+
+class A {
+    override fun hashCode() = 42
+}
+
+class B
+
+fun box(): String {
+    if (A().hashCode() != 42) return "Wrong hash 0"
+
+    val o1 = B();
+    if (o1.hashCode() != o1.hashCode()) return "Wrong hash 1"
+
+    val o2 = js("\"\"")
+    if (o2.hashCode() != o2.hashCode()) return "Wrong hash 2"
+
+    val o3 = js("123")
+    if (o3.hashCode() != o3.hashCode()) return "Wrong hash 3"
+
+    val o4 = 123
+    if (o4.hashCode() != o4.hashCode()) return "Wrong hash 4"
+
+    val o5 = "123"
+    if (o5.hashCode() != o5.hashCode()) return "Wrong hash 5"
+
+    val o6 = (123 as Any)
+    if (o6.hashCode() != o6.hashCode()) return "Wrong hash 6"
+
+    return "OK"
+}