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

tests/stress/try_catch_throw.js

@@ -0,0 +1,11 @@
+var ITERATIONS = 20000;
+
+var sum = 0;
+for (var i = 0; i < ITERATIONS; i++) {
+  try {
+    throw new Error("boom");
+  } catch (e) {
+    sum += e.message.length;
+  }
+}
+sum