JS backend: switched to use native Function.bind(from ES5) instead library function b0-b4.

Removed unnecessary functions from jslib.

(cherry picked from commit f6550e9)

js/js.translator/testFiles/kotlin_lib.js

@@ -569,52 +569,9 @@ var kotlin = {set:function (receiver, key, value) {
     Kotlin.sure = function (obj) {
         return obj;
     };
-
-    // native concat doesn't work for arguments
-    Kotlin.concat = function (a, b) {
-        var r = new Array(a.length + b.length);
-        var i = 0;
-        var n = a.length;
-        for (; i < n; i++) {
-            r[i] = a[i];
-        }
-        n = b.length;
-        for (var j = 0; j < n;) {
-            r[i++] = b[j++];
-        }
-        return r;
-    }
 })();
 
 Kotlin.assignOwner = function(f, o) {
   f.o = o;
   return f;
 };
-
-// we cannot use Function.bind, because if we bind with null self, but call with not null — fun must receive passed not null self
-// test case: WebDemoExamples2Test.testBuilder
-Kotlin.b0 = function (f, self, value) {
-    return function () {
-        return f.call(self !== null ? self : this, value);
-    }
-};
-Kotlin.b1 = function (f, self, values) {
-    return function () {
-        return f.apply(self !== null ? self : this, values);
-    }
-};
-Kotlin.b2 = function (f, self, values) {
-    return function () {
-        return f.apply(self !== null ? self : this, Kotlin.concat(values, arguments));
-    }
-};
-Kotlin.b3 = function (f, self) {
-    return function () {
-        return f.call(self)
-    }
-};
-Kotlin.b4 = function (f, self) {
-    return function () {
-        return f.apply(self, Kotlin.argumentsToArrayLike(arguments));
-    }
-};

js/js.translator/testFiles/kotlin_lib_ecma3.js

@@ -48,15 +48,6 @@ var Kotlin = {};
         return result;
     };
 
-    Kotlin.argumentsToArrayLike = function (args) {
-        var n = args.length;
-        var result = new Array(n);
-        while (n--) {
-            result[n] = args[n];
-        }
-        return result;
-    };
-
     function copyProperties(to, from) {
         for (var p in from) {
             if (from.hasOwnProperty(p)) {

js/js.translator/testFiles/kotlin_lib_ecma5.js

@@ -5,11 +5,6 @@ var Kotlin = Object.create(null);
 (function () {
     "use strict";
 
-    // ecma5 is still sucks — concat doesn't accept arguments, but apply does, so, we just return arguments
-    Kotlin.argumentsToArrayLike = function (args) {
-      return args;
-    };
-
     Kotlin.keys = Object.keys;
 
     Kotlin.isType = function (object, type) {