feat: 拆分 stress benchmark 到细粒度单热点测试并修复 bench 采样逻辑

tests/stress/cmp_ops.js

@@ -0,0 +1,13 @@
+var ITERATIONS = 100000;
+
+var sum = 0;
+for (var i = 0; i < ITERATIONS; i++) {
+  var n = i & 1;
+  sum += n == 0;
+  sum += n != 1;
+  sum += n === 0;
+  sum += n !== 1;
+  sum += n < 2;
+  sum += n >= 0;
+}
+sum