Add performance tests for Map/Set with String and Object keys

test/js-perf-test/Collections/weakmap.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 var MapBenchmark = new BenchmarkSuite('WeakMap', [1000], [
-  new Benchmark('Set', false, false, 0, WeakMapSet),
+  new Benchmark('Set', false, false, 0, WeakMapSet, WeakMapSetupBase,
+      WeakMapTearDown),
   new Benchmark('Has', false, false, 0, WeakMapHas, WeakMapSetup,
       WeakMapTearDown),
   new Benchmark('Get', false, false, 0, WeakMapGet, WeakMapSetup,
       WeakMapTearDown),
   new Benchmark('Delete', false, false, 0, WeakMapDelete, WeakMapSetup,
       WeakMapTearDown),
 ]);
 
 
 var wm;
-var N = 10;
-var keys = [];
 
 
-for (var i = 0; i < N * 2; i++) {
-  keys[i] = {};
+function WeakMapSetupBase() {
+  SetupObjectKeys();
+  wm = new WeakMap;
 }
 
 
 function WeakMapSetup() {
-  wm = new WeakMap;
-  for (var i = 0; i < N; i++) {
-    wm.set(keys[i], i);
-  }
+  WeakMapSetupBase();
+  WeakMapSet();
 }
 
 
 function WeakMapTearDown() {
   wm = null;
 }
 
 
 function WeakMapSet() {
-  WeakMapSetup();
-  WeakMapTearDown();
+  for (var i = 0; i < N; i++) {
+    wm.set(keys[i], i);
+  }
 }
 
 
 function WeakMapHas() {
   for (var i = 0; i < N; i++) {
     if (!wm.has(keys[i])) {
       throw new Error();
     }
   }
   for (var i = N; i < 2 * N; i++) {
@@ skipping 18 matching lines @@
 }
 
 
 function WeakMapDelete() {
   // This is run more than once per setup so we will end up deleting items
   // more than once. Therefore, we do not the return value of delete.
   for (var i = 0; i < N; i++) {
     wm.delete(keys[i]);
   }
 }