contentEquals, contentHashCode, contentToString: Add js implementation and tests

#KT-13582

js/js.translator/testData/kotlin_lib.js

@@ -366,6 +366,44 @@
         return true;
     };
 
+    Kotlin.arrayDeepEquals = function (a, b) {
+        if (a === b) {
+            return true;
+        }
+        if (!Array.isArray(b) || a.length !== b.length) {
+            return false;
+        }
+
+        for (var i = 0, n = a.length; i < n; i++) {
+            if (Array.isArray(a[i])) {
+                if (!Kotlin.arrayDeepEquals(a[i], b[i])) {
+                    return false;
+                }
+            } else if (!Kotlin.equals(a[i], b[i])) {
+                return false;
+            }
+        }
+        return true;
+    };
+
+    Kotlin.arrayHashCode = function (arr) {
+        var result = 1;
+        for (var i = 0, n = arr.length; i < n; i++) {
+            result = ((31 * result | 0) + Kotlin.hashCode(arr[i])) | 0;
+        }
+        return result;
+    };
+
+    Kotlin.arrayDeepHashCode = function (arr) {
+        var result = 1;
+        for (var i = 0, n = arr.length; i < n; i++) {
+            var e = arr[i];
+            result = ((31 * result | 0) + (Array.isArray(e) ? Kotlin.arrayDeepHashCode(e) : Kotlin.hashCode(arr[i]))) | 0;
+        }
+        return result;
+    };
+
+
     var BaseOutput = Kotlin.createClassNow(null, null, {
             println: function (a) {
                 if (typeof a !== "undefined") this.print(a);