feat: 添加基准测试基础设施

tests/stress/ic_cache.js

@@ -0,0 +1,13 @@
+var ITERATIONS = 10000;
+
+var objs = [];
+for (var i = 0; i < ITERATIONS; i++) {
+  objs.push({ x: i });
+  if (i % 3 === 0) objs[i].y = i;
+  if (i % 5 === 0) objs[i].z = i;
+}
+var sum = 0;
+for (var i = 0; i < ITERATIONS; i++) {
+  sum += objs[i].x;
+}
+sum