add micro-benchmark for proxy trap setPrototypeOf

Bug: v8:6664
Change-Id: If5a8a85a7537fa429fb58d1e0654ffe5f6a5897f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1669788
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62363}

test/js-perf-test/JSTests4.json

@@ -39,7 +39,9 @@
         {"name": "PreventExtensionsWithoutTrap"},
         {"name": "PreventExtensionsWithTrap"},
         {"name": "GetPrototypeOfWithoutTrap"},
-        {"name": "GetPrototypeOfWithTrap"}
+        {"name": "GetPrototypeOfWithTrap"},
+        {"name": "SetPrototypeOfWithoutTrap"},
+        {"name": "SetPrototypeOfWithTrap"}
       ]
     },
     {

test/js-perf-test/Proxies/proxies.js

@@ -625,3 +625,42 @@ newBenchmark("GetPrototypeOfWithTrap", {
   },
   teardown() {}
 });
+
+// ----------------------------------------------------------------------------
+
+newBenchmark("SetPrototypeOfWithoutTrap", {
+  setup() {
+    var obj = { x: 1 };
+    obj.__proto__ = {};
+    p = new Proxy(obj, {});
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.setPrototypeOf(p, [1]);
+    }
+    return value;
+  },
+  teardown() {}
+});
+
+// ----------------------------------------------------------------------------
+
+newBenchmark("SetPrototypeOfWithTrap", {
+  setup() {
+    var obj = { x: 1 };
+    obj.__proto__ = {};
+    p = new Proxy(obj, {
+      setPrototypeOf: function(target, proto) {
+        Object.setPrototypeOf(target, proto);
+        return true;
+      }
+    });
+  },
+  run() {
+    for(var i = 0; i < ITERATIONS; i++) {
+      value = Object.setPrototypeOf(p, [1]);
+    }
+    return value;
+  },
+  teardown() {}
+});